File: auto-daemon-tests-delay-buffer.pl

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#!/usr/bin/perl

use strict;
use warnings;
use NGCP::Rtpengine::Test;
use NGCP::Rtpclient::SRTP;
use NGCP::Rtpengine::AutoTest;
use Test::More;
use POSIX;


autotest_start(qw(--config-file=none -t -1 -i 203.0.113.1
			-n 2223 -c 12345 -f -L 7 -E -u 2222))
		or die;


my ($sock_a, $sock_b, $sock_c, $sock_d, $port_a, $port_b, $ssrc, $ssrc_b, $resp,
	$sock_ax, $sock_bx, $port_ax, $port_bx,
	$srtp_ctx_a, $srtp_ctx_b, $srtp_ctx_a_rev, $srtp_ctx_b_rev, $ufrag_a, $ufrag_b,
	@ret1, @ret2, @ret3, @ret4, $srtp_key_a, $srtp_key_b, $ts, $seq, $rseq, $sseq);





($sock_a, $sock_b) = new_call([qw(198.51.100.1 4000)], [qw(198.51.100.1 5000)]);

($port_a) = offer('DTMF delay - RFC', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 4000 RTP/AVP 0 101
c=IN IP4 198.51.100.1
a=sendrecv
a=rtpmap:101 telephone-event/8000
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0 101
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=sendrecv
a=rtcp:PORT
SDP

($port_b) = answer('DTMF delay - RFC', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 5000 RTP/AVP 0 101
c=IN IP4 198.51.100.1
a=sendrecv
a=rtpmap:101 telephone-event/8000
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0 101
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=sendrecv
a=rtcp:PORT
SDP

$seq = 0;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# control

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
rcv($sock_b, $port_a, rtpm(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x01\xe0"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x01\xe0"));
Time::HiRes::usleep(18000); $seq++;

# gap

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rtpe_req('block DTMF', 'DTMF block',
	{ 'from-tag' => ft(), 'trigger' => '##', 'trigger-end' => '#', 'DTMF-security-trigger' => 'silence',
		'delay-buffer' => 1, 'DTMF-delay' => 60 });

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\xe0"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff" x 160));
Time::HiRes::usleep(18000); $seq++;

$rseq = $seq;

snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x02\x80"));
rcv($sock_b, $port_a, rtpm(101 | 0x80, 1000 + $seq, 3000 + 160 * $rseq, 0x1234, "\x05\x0a\x00\xa0"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x03\x20"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $rseq, 0x1234, "\x05\x0a\x01\x40"));
Time::HiRes::usleep(18000); $seq++;
# end
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x03\xc0"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $rseq, 0x1234, "\x05\x0a\x01\xe0"));
Time::HiRes::usleep(18000); $seq++;

# back to PCM

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $rseq, 0x1234, "\x05\x0a\x02\x80"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $rseq, 0x1234, "\x05\x0a\x03\x20"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $rseq, 0x1234, "\x05\x0a\x03\xc0"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $rseq, 0x1234, "\x05\x8a\x04\x60"));
rcv($sock_b, $port_a, rtpm(101, 1001 + $seq, 3000 + 160 * $rseq, 0x1234, "\x05\x8a\x04\x60"));
rcv($sock_b, $port_a, rtpm(101, 1002 + $seq, 3000 + 160 * $rseq, 0x1234, "\x05\x8a\x04\x60"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;




($sock_a, $sock_b) = new_call([qw(198.51.100.1 4004)], [qw(198.51.100.1 5004)]);

($port_a) = offer('DTMF delay - PCM', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 4004 RTP/AVP 0
c=IN IP4 198.51.100.1
a=sendrecv
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=sendrecv
a=rtcp:PORT
SDP

($port_b) = answer('DTMF delay - PCM', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 5004 RTP/AVP 0
c=IN IP4 198.51.100.1
a=sendrecv
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=sendrecv
a=rtcp:PORT
SDP

$seq = 0;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# control

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
rcv($sock_b, $port_a, rtpm(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x01\xe0"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x01\xe0"));
Time::HiRes::usleep(18000); $seq++;

# gap

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rtpe_req('block DTMF', 'DTMF block',
	{ 'from-tag' => ft(), 'trigger' => '##', 'trigger-end' => '#', 'DTMF-security-trigger' => 'silence',
		'delay-buffer' => 1, 'DTMF-delay' => 60 });

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
# replaced by silence
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff" x 160));
Time::HiRes::usleep(18000); $seq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xc0\xe9\xfe\xcc\xc6\x66\x35\x2d\x3b\xbe\xa9\xac\xce\x36\x2e\x3b\xe4\xc8\xda\x68\xd7\xbb\xb7\xd6\x35\x29\x31\xd2\xac\xab\xbf\x43\x37\x41\x6e\xfb\x4d\x48\xdb\xb4\xad\xbf\x3b\x29\x2c\x5a\xb3\xae\xbd\x5b\x46\x59\xec\x54\x3b\x38\x63\xb3\xaa\xb4\x4a\x2b\x2c\x44\xbf\xb6\xc2\xf8\x75\xce\xcb\x54\x33\x2e\x44\xb8\xa9\xae\xf0\x31\x2e\x3e\xd4\xc4\xd8\x70\xd2\xbb\xba\x7c\x31\x2a\x37\xc3\xab\xac\xca\x3c\x35\x43\xfa\xef\x4f\x4e\xce\xb2\xaf\xca\x35\x28\x2f\xe3\xaf\xae\xc1\x4e\x43\x57\xf6\x50\x3b\x3c\xe1\xaf\xaa\xba\x3e\x2a\x2d\x50\xba\xb4\xc4\x6e\x6b\xd1\xd1\x4b\x32\x30\x52\xb2\xa8\xb1\x53\x2e\x2e\x45\xca\xc1\xd6\x7a\xcf\xbc\xbe\x56\x2f\x2b\x3d\xba"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xa9\xae\xdb\x38\x34\x46\xe7\xe7\x54\x56\xc8\xb2\xb2\xdf\x30\x28\x33\xca\xad\xae\xc9\x47\x40\x55\xfe\x4f\x3c\x40\xce\xae\xac\xc1\x37\x29\x2f\x70\xb6\xb4\xc8\x5f\x62\xd6\xdb\x46\x32\x34\xfd\xae\xa9\xb6\x44\x2c\x2f\x4d\xc3\xbf\xd6\xfe\xce\xbd\xc3\x49\x2d\x2c\x48\xb4\xa9\xb0\x65\x34\x34\x4a\xdb\xdf\x59\x60\xc3\xb2\xb6\x5e\x2d\x29\x39\xbe\xac\xaf\xd5\x40\x3e\x56\x7d\x4e\x3d\x47\xc4\xad\xad\xd0\x31\x28\x32\xd6\xb2\xb4\xcd\x57\x5c\xdb\xe9\x41\x32\x38\xd2\xad\xaa\xbd\x3b\x2b\x30\x5e\xbe\xbe\xd7\xfe\xce\xbe\xcb\x40\x2d\x2e\x5d\xaf\xa9\xb5\x4c\x30\x34\x4f\xd2\xda\x5e\x74\xc0\xb3\xbb\x4a\x2c\x2a\x41\xb8\xab\xb2\xf2\x3c\x3d\x58\xfe\x4e\x3f\x4f"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;







($sock_a, $sock_b) = new_call([qw(198.51.100.1 4008)], [qw(198.51.100.1 5008)]);

($port_a) = offer('DTMF trigger', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 4008 RTP/AVP 0 101
c=IN IP4 198.51.100.1
a=sendrecv
a=rtpmap:101 telephone-event/8000
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0 101
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=sendrecv
a=rtcp:PORT
SDP

($port_b) = answer('DTMF trigger', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 5008 RTP/AVP 0 101
c=IN IP4 198.51.100.1
a=sendrecv
a=rtpmap:101 telephone-event/8000
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0 101
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=sendrecv
a=rtcp:PORT
SDP

$seq = 0;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# control

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
rcv($sock_b, $port_a, rtpm(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x01\xe0"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x01\xe0"));
Time::HiRes::usleep(18000); $seq++;

# gap

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rtpe_req('block DTMF', 'DTMF block',
	{ 'from-tag' => ft(), 'trigger' => '##', 'trigger-end' => '#', 'DTMF-security-trigger' => 'tone',
		'delay-buffer' => 1, 'DTMF-delay' => 100 });

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\xe0"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x02\x80"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x03\x20"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff" x 160));
Time::HiRes::usleep(18000); $seq++;

$rseq = $seq;

snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x03\xc0"));
rcv($sock_b, $port_a, rtpm(101 | 0x80, 1000 + $seq, 3000 + 160 * $rseq, 0x1234, "\x05\x0a\x00\xa0"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x04\x60"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $rseq, 0x1234, "\x05\x0a\x01\x40"));
Time::HiRes::usleep(18000); $seq++;
# end
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x05\x00"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $rseq, 0x1234, "\x05\x0a\x01\xe0"));
Time::HiRes::usleep(18000); $seq++;

# back to PCM

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $rseq, 0x1234, "\x05\x0a\x02\x80"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $rseq, 0x1234, "\x05\x0a\x03\x20"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $rseq, 0x1234, "\x05\x0a\x03\xc0"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $rseq, 0x1234, "\x05\x0a\x04\x60"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $rseq, 0x1234, "\x05\x0a\x05\x00"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $rseq, 0x1234, "\x05\x8a\x05\xa0"));
rcv($sock_b, $port_a, rtpm(101, 1001 + $seq, 3000 + 160 * $rseq, 0x1234, "\x05\x8a\x05\xa0"));
rcv($sock_b, $port_a, rtpm(101, 1002 + $seq, 3000 + 160 * $rseq, 0x1234, "\x05\x8a\x05\xa0"));

Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# trigger

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x0b\x0a\x00\xa0"));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\xff" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x0b\x8a\x01\x40"));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\xff" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\xff" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x0b\x0a\x00\xa0"));
# trigger matched, now tone
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x0b\x8a\x01\x40"));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
Time::HiRes::usleep(18000); $seq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x01\x0a\x00\xa0"));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x01\x8a\x01\x40"));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
Time::HiRes::usleep(18000); $seq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x02\x0a\x00\xa0"));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x02\x8a\x01\x40"));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
Time::HiRes::usleep(18000); $seq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# end trigger

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x0b\x0a\x00\xa0"));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x0b\x8a\x01\x40"));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\xff" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1002 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;









($sock_a, $sock_b) = new_call([qw(198.51.100.1 2000)], [qw(198.51.100.1 3000)]);

($port_a) = offer('PCM DTMF block', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 2000 RTP/AVP 0
c=IN IP4 198.51.100.1
a=sendrecv
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=sendrecv
a=rtcp:PORT
SDP

($port_b) = answer('PCM DTMF block', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 3000 RTP/AVP 0
c=IN IP4 198.51.100.1
a=sendrecv
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=sendrecv
a=rtcp:PORT
SDP

$seq = 0;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# control

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
Time::HiRes::usleep(18000); $seq++;

# gap

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# enable blocking

rtpe_req('block DTMF', 'PCM DTMF block',
	{ 'from-tag' => ft(), 'DTMF-security' => 'tone', 'delay-buffer' => 1 });

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
# replaced by tone
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
Time::HiRes::usleep(18000); $seq++;

# gap

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
# still tone
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# disable blocking

rtpe_req('unblock DTMF', 'PCM DTMF block',
	{ 'from-tag' => ft() });

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# enable blocking

rtpe_req('block DTMF', 'PCM DTMF block',
	{ 'from-tag' => ft(), 'DTMF-security' => 'tone', 'delay-buffer' => 100 });

# pre-send 100 ms worth of audio

$rseq = $seq;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# start receiving

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

# start DTMF, interleaved with receiving older audio

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
Time::HiRes::usleep(18000); $seq++;

# still buffered silence

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
Time::HiRes::usleep(18000); $seq++;

# now replaced by tone

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

# back to silence

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# still tone

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# finally back to silence

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

# disable blocking

rtpe_req('unblock DTMF', 'PCM DTMF block',
	{ 'from-tag' => ft(), 'delay-buffer' => 0 });

# buffer flushing

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

# sync forwarding

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;






($sock_a, $sock_b) = new_call([qw(198.51.100.1 2002)], [qw(198.51.100.1 3002)]);

($port_a) = offer('PCM DTMF block w transcoding', { codec => { transcode => ['PCMA'] } }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 2002 RTP/AVP 0
c=IN IP4 198.51.100.1
a=sendrecv
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0 8
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=sendrecv
a=rtcp:PORT
SDP

($port_b) = answer('PCM DTMF block w transcoding', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 3002 RTP/AVP 8
c=IN IP4 198.51.100.1
a=sendrecv
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=sendrecv
a=rtcp:PORT
SDP

$seq = 0;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
($ssrc) = rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, -1, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

# control

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\xd5\x9b\x87\x97\x64\x10\x6b\x41\xdc\x73\x66\xd1\x91\x9a\x97\x6d\x07\x04\x67\x91\x9a\x96\x5c\x60\x7d\xd3\x4d\x6b\x11\x7c\x91\x87\x9e\x4f\x1a\x04\x15\xe0\x93\xe8\xda\x59\xf1\xe4\x44\x10\x1b\x6b\xeb\x87\x85\xfc\x12\x1a\x17\xc3\xe2\xfc\x51\xc9\xeb\x96\xcb\x13\x07\x1c\xff\x85\x84\xee\x6f\x12\x68\x5c\xc5\x76\x7b\xc9\x93\x98\xef\x14\x06\x1a\x4f\x9c\x9a\x95\x77\x6c\x7f\xd7\x75\x6b\x14\x59\x9d\x87\x93\x66\x04\x04\x63\xeb\x9d\xe9\xd7\x41\xf4\xff\x71\x12\x19\x61\x91\x86\x9b\xd5\x1e\x1a\x68\xfc\xee\xff\x55\xf4\xeb\x95\x53\x1c\x04\x11\xec\x87\x85\xe5\x14\x1d\x6f\xd1\xcd\x4b\x73\xfc\x92\x9f\xfb\x12\x06\x19\xcd\x98\x9a\xef\x65\x69\x7e\x55\x77\x68"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x68\xc2\x9e\x84\x94\x6b\x07\x1a\x72\x96\x9c\xec\x59\x49\xcf\xf7\x7b\x12\x1c\x76\x9c\x86\x9f\x7c\x1a\x1a\x63\xe6\xeb\xfe\xd5\xf6\xe9\xef\x71\x19\x05\x68\x97\x86\x9b\xc2\x10\x1c\x62\xc1\xf5\x43\x49\xe4\x92\x92\xda\x1e\x06\x12\xe7\x85\x9b\xe7\x62\x6b\x7e\x55\x76\x69\x62\xf9\x98\x85\xe2\x10\x06\x18\x54\x92\x9c\xe0\x49\x76\xc7\xc3\x66\x12\x13\xd3\x98\x86\x91\x6c\x05\x1b\x79\xef\x95\xff\x54\xf6\xef\xe1\x67\x1b\x1a\x64\x9d\x86\x9e\x43\x1c\x1c\x67\xf6\xf0\x5a\x5a\xe0\x92\x91\x49\x1b\x07\x17\xeb\x84\x98\xf6\x68\x15\x7c\xd7\x76\x6c\x64\xe0\x9b\x9b\xf0\x1f\x06\x1c\xf3\x9e\x9c\xe5\x72\x72\xde\xdd\x63\x12\x17\xfd\x9a\x87\xe8\x17\x04\x1e\x41\x95"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x94\xfd\x51\xf7\xed\xfe\x6c\x1b\x19\x47\x99\x86\x93\x64\x19\x1c\x7e\xf9\xfc\x52\x57\xe2\x93\x95\x64\x05\x04\x6d\x90\x87\x9f\xd4\x17\x14\x73\xd3\x74\x63\x70\xe9\x9b\x9f\x52\x1b\x06\x11\xe3\x9b\x9d\xf1\x65\x7e\xd1\x56\x6d\x13\x69\xe3\x85\x85\xe4\x12\x07\x1d\xc7\x96\x94\xf1\x5f\xf5\xe1\xc9\x6b\x1b\x1d\xcb\x85\x86\x94\x69\x1a\x12\x49\xe7\xf9\x57\xdd\xec\x90\xe2\x6e\x04\x05\x73\x9f\x87\x93\x76\x10\x14\x77\xd8\x4b\x66\x44\x94\x9b\x93\x7e\x05\x07\x68\x94\x9a\x93\xda\x60\x7b\x54\x59\x6f\x11\x66\xeb\x84\x9a\xc6\x19\x07\x11\xf9\x93\x94\xcb\x44\xcf\xe4\xd0\x17\x1b\x16\xe6\x84\x87\xe2\x16\x05\x10\x54\xe2\xe5\xd7\xc5\xef\x96\xfb\x17\x04\x18\xd3"));
Time::HiRes::usleep(18000); $seq++;

# gap

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

# enable blocking

rtpe_req('block DTMF', 'PCM DTMF block w transcoding',
	{ 'from-tag' => ft(), 'DTMF-security' => 'tone', 'delay-buffer' => 1 });

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\xd5\x9b\x87\x97\x64\x10\x6b\x41\xdc\x73\x66\xd1\x91\x9a\x97\x6d\x07\x04\x67\x91\x9a\x96\x5c\x60\x7d\xd3\x4d\x6b\x11\x7c\x91\x87\x9e\x4f\x1a\x04\x15\xe0\x93\xe8\xda\x59\xf1\xe4\x44\x10\x1b\x6b\xeb\x87\x85\xfc\x12\x1a\x17\xc3\xe2\xfc\x51\xc9\xeb\x96\xcb\x13\x07\x1c\xff\x85\x84\xee\x6f\x12\x68\x5c\xc5\x76\x7b\xc9\x93\x98\xef\x14\x06\x1a\x4f\x9c\x9a\x95\x77\x6c\x7f\xd7\x75\x6b\x14\x59\x9d\x87\x93\x66\x04\x04\x63\xeb\x9d\xe9\xd7\x41\xf4\xff\x71\x12\x19\x61\x91\x86\x9b\xd5\x1e\x1a\x68\xfc\xee\xff\x55\xf4\xeb\x95\x53\x1c\x04\x11\xec\x87\x85\xe5\x14\x1d\x6f\xd1\xcd\x4b\x73\xfc\x92\x9f\xfb\x12\x06\x19\xcd\x98\x9a\xef\x65\x69\x7e\x55\x77\x68"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x68\xc2\x9e\x84\x94\x6b\x07\x1a\x72\x96\x9c\xec\x59\x49\xcf\xf7\x7b\x12\x1c\x76\x9c\x86\x9f\x7c\x1a\x1a\x63\xe6\xeb\xfe\xd5\xf6\xe9\xef\x71\x19\x05\x68\x97\x86\x9b\xc2\x10\x1c\x62\xc1\xf5\x43\x49\xe4\x92\x92\xda\x1e\x06\x12\xe7\x85\x9b\xe7\x62\x6b\x7e\x55\x76\x69\x62\xf9\x98\x85\xe2\x10\x06\x18\x54\x92\x9c\xe0\x49\x76\xc7\xc3\x66\x12\x13\xd3\x98\x86\x91\x6c\x05\x1b\x79\xef\x95\xff\x54\xf6\xef\xe1\x67\x1b\x1a\x64\x9d\x86\x9e\x43\x1c\x1c\x67\xf6\xf0\x5a\x5a\xe0\x92\x91\x49\x1b\x07\x17\xeb\x84\x98\xf6\x68\x15\x7c\xd7\x76\x6c\x64\xe0\x9b\x9b\xf0\x1f\x06\x1c\xf3\x9e\x9c\xe5\x72\x72\xde\xdd\x63\x12\x17\xfd\x9a\x87\xe8\x17\x04\x1e\x41\x95"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
# replaced by tone
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
Time::HiRes::usleep(18000); $seq++;

# gap

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
# still tone
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

# disable blocking

rtpe_req('unblock DTMF', 'PCM DTMF block w transcoding',
	{ 'from-tag' => ft() });

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

# enable blocking

rtpe_req('block DTMF', 'PCM DTMF block w transcoding',
	{ 'from-tag' => ft(), 'DTMF-security' => 'tone', 'delay-buffer' => 100 });

# pre-send 100 ms worth of audio

$rseq = $seq;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# start receiving

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

# start DTMF, interleaved with receiving older audio

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
Time::HiRes::usleep(18000); $seq++;

# still buffered silence

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
Time::HiRes::usleep(18000); $seq++;

# now replaced by tone

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

# back to silence

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# still tone

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# finally back to silence

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

# disable blocking

rtpe_req('unblock DTMF', 'PCM DTMF block w transcoding',
	{ 'from-tag' => ft(), 'delay-buffer' => 0 });

# buffer flushing

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

# sync forwarding

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;




($sock_a, $sock_b) = new_call([qw(198.51.100.1 2004)], [qw(198.51.100.1 3004)]);

($port_a) = offer('PCM DTMF block w event PT', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 2004 RTP/AVP 0 101
c=IN IP4 198.51.100.1
a=rtpmap:101 telephone-event/8000
a=sendrecv
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0 101
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=sendrecv
a=rtcp:PORT
SDP

($port_b) = answer('PCM DTMF block w event PT', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 3004 RTP/AVP 0 101
c=IN IP4 198.51.100.1
a=rtpmap:101 telephone-event/8000
a=sendrecv
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0 101
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=sendrecv
a=rtcp:PORT
SDP

$seq = 0;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# control

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
rcv($sock_b, $port_a, rtpm(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x01\xe0"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x01\xe0"));
Time::HiRes::usleep(18000); $seq++;

# gap

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# enable blocking

rtpe_req('block DTMF', 'PCM DTMF block w event PT',
	{ 'from-tag' => ft(), 'DTMF-security' => 'tone', 'delay-buffer' => 1 });

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
# replaced by tone
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x01\xe0"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
Time::HiRes::usleep(18000); $seq++;

# gap

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# disable blocking

rtpe_req('unblock DTMF', 'PCM DTMF block w event PT',
	{ 'from-tag' => ft() });

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# enable blocking

rtpe_req('block DTMF', 'PCM DTMF block w event PT',
	{ 'from-tag' => ft(), 'DTMF-security' => 'tone', 'delay-buffer' => 100 });

# pre-send 100 ms worth of audio

$rseq = $seq;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# start receiving

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

# send interleaved with received old PCM

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

# send some non-silence to make sure we drop it

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x11" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x11" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x11" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x11" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

# start DTMF

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
Time::HiRes::usleep(18000); $seq++;

# tone output immediately

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x01\xe0"));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

# input some non-silence to make sure it's also dropped

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x22" x 160));
Time::HiRes::usleep(18000); $seq++;

# still tone

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x22" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x22" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

# switch back to silence

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# still tone

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35\xff\xb5\xa7\x9f\x9c\x9b\x9c\x9f\xa7\xb5\xff\x35\x27\x1f\x1c\x1b\x1c\x1f\x27\x35"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# finally back to silence

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

# disable blocking

rtpe_req('unblock DTMF', 'PCM DTMF block w event PT',
	{ 'from-tag' => ft(), 'delay-buffer' => 0 });

# buffer flushing

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

# sync forwarding

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;






($sock_a, $sock_b) = new_call([qw(198.51.100.1 2006)], [qw(198.51.100.1 3006)]);

($port_a) = offer('PCM DTMF block w transcoding w event PT', { codec => { transcode => ['PCMA'] } }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 2006 RTP/AVP 0 101
c=IN IP4 198.51.100.1
a=rtpmap:101 telephone-event/8000
a=sendrecv
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0 8 101
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=sendrecv
a=rtcp:PORT
SDP

($port_b) = answer('PCM DTMF block w transcoding w event PT', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 3006 RTP/AVP 8 101
c=IN IP4 198.51.100.1
a=rtpmap:101 telephone-event/8000
a=sendrecv
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0 101
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=sendrecv
a=rtcp:PORT
SDP

$seq = 0;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
($ssrc) = rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, -1, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

# control

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
rcv($sock_b, $port_a, rtpm(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, $ssrc, "\x05\x0a\x00\xa0"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $sseq, $ssrc, "\x05\x0a\x01\x40"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x01\xe0"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $sseq, $ssrc, "\x05\x8a\x01\xe0"));
Time::HiRes::usleep(18000); $seq++;

# gap

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

# enable blocking

rtpe_req('block DTMF', 'PCM DTMF block w transcoding w event PT',
	{ 'from-tag' => ft(), 'DTMF-security' => 'tone', 'delay-buffer' => 1 });

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
# replaced by tone
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x01\xe0"));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
Time::HiRes::usleep(18000); $seq++;

# gap

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

# disable blocking

rtpe_req('unblock DTMF', 'PCM DTMF block w transcoding w event PT',
	{ 'from-tag' => ft() });

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

# enable blocking

rtpe_req('block DTMF', 'PCM DTMF block w transcoding w event PT',
	{ 'from-tag' => ft(), 'DTMF-security' => 'tone', 'delay-buffer' => 100 });

# pre-send 100 ms worth of audio

$rseq = $seq;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# start receiving

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

# send interleaved with received old PCM

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

# send some non-silence to make sure we drop it

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x11" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x11" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x11" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x11" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

# start DTMF

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
Time::HiRes::usleep(18000); $seq++;

# tone output immediately

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x01\xe0"));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

# input some non-silence to make sure it's also dropped

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x22" x 160));
Time::HiRes::usleep(18000); $seq++;

# still tone

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x22" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x22" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

# switch back to silence

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# still tone

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c\xd5\x9c\x82\xb5\xb6\xb1\xb6\xb5\x82\x9c\xd5\x1c\x02\x35\x36\x31\x36\x35\x02\x1c"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# finally back to silence

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

# disable blocking

rtpe_req('unblock DTMF', 'PCM DTMF block w transcoding w event PT',
	{ 'from-tag' => ft(), 'delay-buffer' => 0 });

# buffer flushing

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

# sync forwarding

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;




($sock_a, $sock_b) = new_call([qw(198.51.100.1 2008)], [qw(198.51.100.1 3008)]);

($port_a) = offer('zero DTMF block w event PT', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 2008 RTP/AVP 0 101
c=IN IP4 198.51.100.1
a=rtpmap:101 telephone-event/8000
a=sendrecv
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0 101
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=sendrecv
a=rtcp:PORT
SDP

($port_b) = answer('zero DTMF block w event PT', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 3008 RTP/AVP 0 101
c=IN IP4 198.51.100.1
a=rtpmap:101 telephone-event/8000
a=sendrecv
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0 101
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=sendrecv
a=rtcp:PORT
SDP

$seq = 0;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# control

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
rcv($sock_b, $port_a, rtpm(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x01\xe0"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x01\xe0"));
Time::HiRes::usleep(18000); $seq++;

# gap

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# enable blocking

rtpe_req('block DTMF', 'zero DTMF block w event PT',
	{ 'from-tag' => ft(), 'DTMF-security' => 'zero', 'delay-buffer' => 1 });

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
# replaced by zero
rcv($sock_b, $port_a, rtpm(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x00\x0a\x00\xa0"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x00\x0a\x01\x40"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x01\xe0"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x00\x8a\x01\xe0"));
Time::HiRes::usleep(18000); $seq++;

# gap

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# disable blocking

rtpe_req('unblock DTMF', 'zero DTMF block w event PT',
	{ 'from-tag' => ft() });

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# enable blocking

rtpe_req('block DTMF', 'zero DTMF block w event PT',
	{ 'from-tag' => ft(), 'DTMF-security' => 'zero', 'delay-buffer' => 100 });

# pre-send 100 ms worth of audio

$rseq = $seq;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# start receiving

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

# send interleaved with received old PCM

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

# send some non-silence to make sure we drop it

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x11" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x11" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x11" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x11" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

# start DTMF

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
Time::HiRes::usleep(18000); $seq++;

# buffered PCM now replaced by silence

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff" x 160));
$rseq++;

snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff" x 160));
$rseq++;

snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x01\xe0"));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff" x 160));
$rseq++;

# input some non-silence to make sure it's also dropped

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x22" x 160));
Time::HiRes::usleep(18000); $seq++;

# still silence

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff" x 160));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x22" x 160));
Time::HiRes::usleep(18000); $seq++;

# now the adjusted DTMF is getting through

$sseq = $rseq;

rcv($sock_b, $port_a, rtpm(101 | 0x80, 1000 + $rseq, 3000 + 160 * $sseq, 0x1234, "\x00\x0a\x00\xa0"));
$rseq++;

# continue non-silence

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x22" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(101, 1000 + $rseq, 3000 + 160 * $sseq, 0x1234, "\x00\x0a\x01\x40"));
$rseq++;

# switch back to silence

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# old DTMF end event now coming through

rcv($sock_b, $port_a, rtpm(101, 1000 + $rseq, 3000 + 160 * $sseq, 0x1234, "\x00\x8a\x01\xe0"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# audio still replaced by silence

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff" x 160));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff" x 160));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff" x 160));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff" x 160));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xff" x 160));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# finally back to silence

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

# disable blocking

rtpe_req('unblock DTMF', 'zero DTMF block w event PT',
	{ 'from-tag' => ft(), 'delay-buffer' => 0 });

# buffer flushing

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

# sync forwarding

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;






($sock_a, $sock_b) = new_call([qw(198.51.100.1 2010)], [qw(198.51.100.1 3010)]);

($port_a) = offer('zero DTMF block w transcoding w event PT', { codec => { transcode => ['PCMA'] } }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 2010 RTP/AVP 0 101
c=IN IP4 198.51.100.1
a=rtpmap:101 telephone-event/8000
a=sendrecv
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0 8 101
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=sendrecv
a=rtcp:PORT
SDP

($port_b) = answer('zero DTMF block w transcoding w event PT', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 3010 RTP/AVP 8 101
c=IN IP4 198.51.100.1
a=rtpmap:101 telephone-event/8000
a=sendrecv
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0 101
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=sendrecv
a=rtcp:PORT
SDP

$seq = 0;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
($ssrc) = rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, -1, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

# control

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
rcv($sock_b, $port_a, rtpm(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, $ssrc, "\x05\x0a\x00\xa0"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $sseq, $ssrc, "\x05\x0a\x01\x40"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x01\xe0"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $sseq, $ssrc, "\x05\x8a\x01\xe0"));
Time::HiRes::usleep(18000); $seq++;

# gap

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

# enable blocking

rtpe_req('block DTMF', 'zero DTMF block w transcoding w event PT',
	{ 'from-tag' => ft(), 'DTMF-security' => 'zero', 'delay-buffer' => 1 });

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
# replaced by zero
rcv($sock_b, $port_a, rtpm(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, $ssrc, "\x00\x0a\x00\xa0"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $sseq, $ssrc, "\x00\x0a\x01\x40"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x01\xe0"));
rcv($sock_b, $port_a, rtpm(101, 1000 + $seq, 3000 + 160 * $sseq, $ssrc, "\x00\x8a\x01\xe0"));
Time::HiRes::usleep(18000); $seq++;

# gap

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\xd5" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

# disable blocking

rtpe_req('unblock DTMF', 'zero DTMF block w transcoding w event PT',
	{ 'from-tag' => ft() });

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

# enable blocking

rtpe_req('block DTMF', 'zero DTMF block w transcoding w event PT',
	{ 'from-tag' => ft(), 'DTMF-security' => 'zero', 'delay-buffer' => 100 });

# pre-send 100 ms worth of audio

$rseq = $seq;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# start receiving

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

# send interleaved with received old PCM

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

# send some non-silence to make sure we drop it

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x11" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x11" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x11" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x11" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

# start DTMF

$sseq = $seq;

snd($sock_a, $port_b,  rtp(101 | 0x80, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x00\xa0"));
Time::HiRes::usleep(18000); $seq++;

# buffered PCM now replaced by silence

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5" x 160));
$rseq++;

snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x0a\x01\x40"));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5" x 160));
$rseq++;

snd($sock_a, $port_b,  rtp(101, 1000 + $seq, 3000 + 160 * $sseq, 0x1234, "\x05\x8a\x01\xe0"));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5" x 160));
$rseq++;

# input some non-silence to make sure it's also dropped

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x22" x 160));
Time::HiRes::usleep(18000); $seq++;

# still silence

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5" x 160));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x22" x 160));
Time::HiRes::usleep(18000); $seq++;

# now the adjusted DTMF is getting through

$sseq = $rseq;

rcv($sock_b, $port_a, rtpm(101 | 0x80, 1000 + $rseq, 3000 + 160 * $sseq, $ssrc, "\x00\x0a\x00\xa0"));
$rseq++;

# continue non-silence

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x22" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(101, 1000 + $rseq, 3000 + 160 * $sseq, $ssrc, "\x00\x0a\x01\x40"));
$rseq++;

# switch back to silence

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# old DTMF end event now coming through

rcv($sock_b, $port_a, rtpm(101, 1000 + $rseq, 3000 + 160 * $sseq, $ssrc, "\x00\x8a\x01\xe0"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5" x 160));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5" x 160));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5" x 160));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5" x 160));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xd5" x 160));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# finally back to silence

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

# disable blocking

rtpe_req('unblock DTMF', 'zero DTMF block w transcoding w event PT',
	{ 'from-tag' => ft(), 'delay-buffer' => 0 });

# buffer flushing

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

# sync forwarding

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;




($sock_a, $sock_b) = new_call([qw(198.51.100.1 2016)], [qw(198.51.100.1 3016)]);

($port_a) = offer('zero DTMF block', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 2016 RTP/AVP 0
c=IN IP4 198.51.100.1
a=sendrecv
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=sendrecv
a=rtcp:PORT
SDP

($port_b) = answer('zero DTMF block', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 3016 RTP/AVP 0
c=IN IP4 198.51.100.1
a=sendrecv
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=sendrecv
a=rtcp:PORT
SDP

$seq = 0;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# control

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
Time::HiRes::usleep(18000); $seq++;

# gap

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# enable blocking

rtpe_req('block DTMF', 'zero DTMF block',
	{ 'from-tag' => ft(), 'DTMF-security' => 'zero', 'delay-buffer' => 1 });

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
# replaced by DTMF zero
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xb8\x2b\x1c\x22\xcc\x9f\x9d\xb6\x2f\x24\x2f\xe2\xbd\xcd\x6b\xcd\xb2\xb1\x60\x27\x1f\x32\xad\x9b\xa0\x62\x20\x1e\x34\xb5\xa8\xb3\x7b\x4b\xf0\xd4\x47\x2d\x2c\x71\xa6\x9e\xad\x2f\x1c\x1f\x60\xa4\x9f\xb3\x3c\x2d\x39\x70\xea\x49\x47\xc4\xa9\xa8\xd5\x25\x1c\x2a\xb3\x9c\x9f\xcd\x27\x21\x33\xc3\xb2\xbf\xf3\xd8\xbb\xbd\x44\x26\x24\x48\xa6\x9c\xa8\x38\x1d\x1f\x44\xab\xa4\xb4\x4d\x3b\x4e\xf2\x49\x32\x36\xc7\xa4\xa1\xbe\x27\x1b\x25\xbe\x9e\x9f\xbe\x2e\x28\x37\xda\xc9\x73\x5d\xc0\xad\xaf\x4b\x23\x1e\x38\xa9\x9b\xa3\x49\x20\x20\x3c\xb4\xac\xbb\x6a\x67\xca\xce\x3d\x29\x2b\xd6\xa2\x9d\xb2\x2b\x1b\x22\xd9\xa3\xa2\xbb\x3b\x31\x42\xfc\x55\x3c\x44\xbb"));
Time::HiRes::usleep(18000); $seq++;

# gap

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
# still DTMF zero
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xa5\xa7\x70\x22\x1c\x2e\xad\x9c\xa1\xf3\x27\x25\x3b\xc2\xba\xd0\x7d\xc5\xb3\xbc\x3b\x22\x24\x5a\xa2\x9b\xab\x31\x1d\x21\x56\xab\xa8\xbc\x4d\x47\xf6\xec\x3d\x2d\x35\xbc\xa0\xa0\xc9\x23\x1b\x29\xb7\x9e\xa2\xcb\x2e\x2c\x3f\xdb\xe4\x4c\x5b\xb8\xa9\xaf\x3e\x1f\x1e\x3f\xa5\x9b\xa7\x3d\x20\x24\x46\xb5\xb0\xc6\x6e\xd3\xbd\xce\x35\x25\x2b\xc4\x9f\x9d\xb9\x28\x1c\x26\xc7\xa4\xa6\xc4\x3c\x39\x53\x77\x42\x34\x44\xb3\xa2\xa7\x4d\x1f\x1c\x33\xaa\x9c\xa5\x54\x28\x29\x43\xc5\xc6\x79\xf1\xba\xad\xbc\x33\x1f\x24\xdf\x9f\x9c\xaf\x2d\x1d\x25\xef\xac\xac\xc6\x51\x62\xce\xfd\x34\x29\x36\xb4\x9e\xa1\xe4\x20\x1b\x2d\xb1\x9f\xa6\xe1\x30\x31\x4b\xe6\x52\x3f"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# disable blocking

rtpe_req('unblock DTMF', 'zero DTMF block',
	{ 'from-tag' => ft() });

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# enable blocking

rtpe_req('block DTMF', 'zero DTMF block',
	{ 'from-tag' => ft(), 'DTMF-security' => 'zero', 'delay-buffer' => 100 });

# pre-send 100 ms worth of audio

$rseq = $seq;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# start receiving

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

# start DTMF, interleaved with receiving older audio

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
Time::HiRes::usleep(18000); $seq++;

# still buffered silence

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
Time::HiRes::usleep(18000); $seq++;

# now replaced by DTMF zero

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x74\xb7\xbc\xdf\xe5\xbd\xb6\xea\x2c\x21\x2f\xb2\x9c\x9f\xd7\x22\x1d\x2d\xb7\xa5\xac\xe0\x3e\x4a\xed\x57\x35\x2f\x55\xaa\x9f\xab\x36\x1c\x1e\x48\xa5\x9d\xad\x3e\x29\x2f\x5b\xcc\xf5\x50\xd1\xaf\xaa\xc9\x2a\x1d\x28\xbb\x9d\x9d\xbe\x28\x1e\x2d\xc7\xad\xb5\xdc\x64\xcc\xc3\x51\x2b\x26\x3f\xaa\x9c\xa5\x40\x1e\x1d\x3a\xab\xa0\xad\x51\x33\x3c\x66\x5f\x3d\x3a\xd6\xa9\xa3\xb9\x2b\x1c\x22\xcc\x9f\x9d\xb6\x2f\x24\x2f\xe0\xbc\xca\x71\xcf\xb4\xb2\x60\x27\x1f\x32\xad\x9c\xa0\x60\x20\x1e\x34\xb4\xa8\xb2\x7a\x48\x72\xd7\x49\x2e\x2d\x74\xa6\x9e\xae\x2f\x1c\x1f\x61\xa3\x9f\xb2\x3b\x2c\x37\x6f\xe0\x4c\x49\xc5\xaa\xa9\xd6\x26\x1d\x2b\xb3\x9c\x9f\xcd\x27"));
$rseq++;

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x20\x32\xc2\xb1\xbe\xf0\xdc\xbd\xbe\x45\x27\x25\x48\xa6\x9c\xa8\x38\x1d\x1f\x44\xaa\xa3\xb4\x4c\x3a\x4b\xf8\x4b\x34\x37\xc7\xa5\xa1\xbe\x27\x1b\x25\xbe\x9e\x9f\xbe\x2e\x27\x36\xd9\xc6\xf1\x5f\xc2\xad\xb0\x4c\x23\x1f\x38\xa9\x9b\xa3\x48\x20\x20\x3c\xb3\xab\xba\x68\x5d\xce\xcf\x3d\x29\x2c\xd5\xa2\x9d\xb2\x2b\x1b\x22\xd8\xa3\xa1\xba\x3a\x30\x40\xfa\x5a\x3d\x45\xbc\xa6\xa8\x6e\x22\x1c\x2e\xad\x9c\xa1\xf6\x26\x24\x3a\xc1\xb8\xcd\x7e\xc7\xb4\xbc\x3b\x23\x24\x5b\xa2\x9b\xab\x31\x1d\x21\x56\xaa\xa7\xbb\x4b\x44\x70\xee\x3e\x2d\x36\xbc\xa1\xa1\xca\x23\x1b\x29\xb7\x9e\xa2\xcb\x2e\x2b\x3e\xd9\xdc\x4f\x5d\xb9\xa9\xaf\x3e\x1f\x1f\x3f\xa5\x9b\xa7"));
$rseq++;

# back to silence

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# still tone

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x3d\x20\x23\x46\xb4\xaf\xc4\x6b\xd9\xbf\xcf\x36\x25\x2b\xc4\x9f\x9d\xb9\x27\x1b\x26\xc6\xa3\xa5\xc3\x3b\x38\x4f\x7a\x45\x36\x46\xb4\xa2\xa8\x4d\x1f\x1c\x33\xaa\x9c\xa5\x53\x27\x28\x42\xc3\xc2\xf0\xf3\xbb\xae\xbd\x34\x20\x24\xde\x9f\x9c\xaf\x2d\x1d\x25\xee\xab\xab\xc5\x4f\x5a\xd2\xfe\x35\x2a\x37\xb4\x9e\xa1\xe6\x20\x1b\x2d\xb1\x9f\xa6\xe1\x2f\x2f\x4a\xe0\x58\x41\x65\xb1\xa6\xb0\x37\x1e\x1f\x4d\xa2\x9c\xab\x37\x21\x27\x55\xb6\xb8\xd4\xf6\xc3\xb8\xd5\x2f\x22\x2c\xba\x9d\x9e\xc2\x25\x1c\x2a\xbd\xa5\xaa\xcf\x3e\x42\x71\x62\x39\x2f\x49\xae\x9f\xa9\x3e\x1d\x1d\x3b\xa7\x9d\xa9\x47\x29\x2c\x4e\xc9\xd9\x56\xde\xb2\xab\xbf\x2d\x1e\x25\xc7\x9e"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x9c\xb6\x2a\x1e\x29\xd2\xad\xb0\xd1\x5b\xd8\xc5\x61\x2e\x27\x39\xae\x9d\xa2\x54\x1f\x1c\x32\xae\xa0\xaa\x66\x32\x38\x5a\x73\x42\x3a\xf1\xac\xa3\xb3\x2f\x1c\x20\xff\xa0\x9c\xaf\x33\x23\x2c\x70\xba\xc2\xf3\xda\xb8\xb2\xe6\x2a\x20\x2e\xb2\x9c\x9f\xd4\x22\x1d\x2e\xb9\xa7\xae\xe1\x45\x58\xdb\x50\x30\x2d\x52\xa9\x9e\xaa\x36\x1c\x1e\x47\xa5\x9e\xad\x3f\x2b\x32\x5e\xd6\x59\x49\xce\xac\xa9\xc7\x29\x1d\x27\xbb\x9d\x9d\xbe\x29\x1f\x2e\xc9\xaf\xb9\xe2\xf1\xc2\xbe\x4f\x2a\x25\x3d\xaa\x9c\xa5\x42\x1e\x1d\x3a\xac\xa2\xaf\x55\x38\x43\x76\x54\x38\x36\xd5\xa7\xa1\xb7\x2b\x1c\x22\xcd\x9f\x9e\xb7\x30\x26\x31\xe5\xc1\xd9\x60\xca\xaf\xaf\x61\x26\x1f\x31"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xad\x9b\xa0\x65\x21\x1e\x34\xb7\xaa\xb5\x7d\x52\xda\xcf\x45\x2b\x2b\x6d\xa5\x9d\xad\x2f\x1c\x1f\x5e\xa4\xa0\xb4\x3d\x2e\x3b\x72\x70\x42\x43\xc3\xa8\xa7\xd3\x25\x1c\x2a\xb3\x9c\x9f\xcd\x28\x22\x34\xc6\xb6\xc5\xfb\xcf\xb8\xbb\x43\x25\x23\x46\xa6\x9b\xa7\x39\x1d\x1f\x44\xab\xa5\xb6\x4f\x3f\x59\xeb\x44\x2f\x34\xc6\xa3\xa0\xbd\x27\x1b\x25\xbf\x9f\x9f\xbe\x2f\x29\x39\xdd\xcf\x5b\x59\xbe\xab\xae\x4b\x22\x1e\x37\xa9\x9b\xa3\x4a\x21\x21\x3c\xb6\xad\xbe\x6e\xf0\xc4\xcc\x3b\x27\x2a\xd6\xa1\x9d\xb1\x2b\x1b\x22\xdb\xa4\xa3\xbb\x3c\x34\x47\xfe\x4d\x38\x41\xba\xa4\xa6\x76\x21\x1c\x2d\xae\x9c\xa2\xef\x28\x26\x3c\xc5\xbd\xdb\x7a\xc0\xb0\xba\x3a\x21"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x23\x58\xa2\x9b\xab\x32\x1d\x22\x55\xac\xa9\xbe\x4f\x4d\xdd\xe8\x3a\x2b\x33\xbc\xa0\xa0\xc8\x23\x1b\x29\xb8\x9f\xa3\xcc\x30\x2d\x42\xdf\x71\x46\x59\xb6\xa7\xae\x3e\x1f\x1e\x3e\xa5\x9b\xa7\x3e\x21\x25\x47\xb7\xb4\xcb\x77\xcb\xba\xcc\x33\x23\x2a\xc4\x9f\x9d\xb8\x28\x1c\x26\xc8\xa5\xa7\xc5\x3e\x3d\x5c\x70\x3e\x31\x42\xb2\xa0\xa7\x4d\x1f\x1c\x33\xab\x9d\xa6\x56\x29\x2a\x45\xc9\xcd\x60\xf0\xb7\xac\xbb\x32\x1f\x23\xe1\x9f\x9c\xaf\x2e\x1e\x26\xf4\xad\xae\xc9\x57\xf3\xc9\xfa\x32\x28\x34\xb4\x9e\xa0\xe0\x20\x1c\x2d\xb2\x9f\xa7\xe0\x32\x34\x4f\xf1\x4a\x3c\x60\xaf\xa4\xaf\x36\x1d\x1f\x4c\xa3\x9c\xab\x39\x23\x29\x56\xba\xbd\xdf\xe7\xbc\xb3\xd1"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x2d\x20\x2b\xba\x9d\x9e\xc1\x25\x1c\x2a\xbf\xa6\xab\xd1\x43\x4c\xe4\x5c\x35\x2d\x47\xad\x9e\xa8\x3e\x1d\x1d\x3b\xa8\x9d\xaa\x49\x2a\x2f\x51\xd0\x74\x4c\xdb\xaf\xa9\xbe\x2d\x1d\x25\xc8\x9e\x9c\xb6\x2b\x1f\x2a\xd6\xaf\xb5\xd7\x6c\xca\xbe\x5f\x2c\x25\x37\xad\x9d\xa2\x57\x1f\x1c\x32\xaf\xa1\xac\x6a\x36\x3d\x64\x5f\x3c\x36\xf4\xaa\xa1\xb1\x2f\x1c\x20\x74\xa0\x9d\xaf\x34\x25\x2d\x6f\xbe\xcc\x69\xd2\xb3\xaf\xe1\x29\x1f\x2d\xb2\x9c\x9f\xd2\x23\x1e\x2e\xbb\xa9\xb0\xe3\x4c\xf7\xd0\x4d\x2e\x2b\x4f\xa8\x9d\xaa\x36\x1c\x1e\x46\xa6\x9f\xae\x42\x2d\x37\x62\xe9\x4a\x43\xcc\xaa\xa7\xc4\x28\x1c\x27\xbc\x9d\x9e\xbe\x2a\x21\x2f\xcc\xb3\xbe\xec\xdb\xbb"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xba\x4e\x28\x23\x3c\xa9\x9c\xa4\x43\x1e\x1e\x3a\xad\xa4\xb0\x59\x3c\x4c\xee\x4c\x33\x33\xd4\xa6\xa0\xb6\x2b\x1b\x22\xcf\x9f\x9e\xb7\x32\x28\x34\xea\xc9\x7a\x58\xc5\xad\xad\x63\x25\x1e\x30\xad\x9b\xa0\x6b\x22\x1f\x35\xb9\xac\xb9\xfe\x65\xcb\xca\x41\x29\x29\x69\xa4\x9d\xac\x2f\x1c\x1f\x5c\xa5\xa1\xb5\x3f\x31\x3f\x77\x58\x3c\x3f\xc0\xa6\xa5\xd0\x24\x1c\x2a\xb4\x9d\x9f\xcc\x29\x24\x36\xc9\xba\xce\x77\xc8\xb3\xb8\x41\x24\x22\x44\xa5\x9b\xa7\x3a\x1e\x20\x44\xad\xa8\xb8\x54\x47\xfd\xe1\x3f\x2d\x31\xc5\xa2\x9f\xbc\x27\x1b\x25\xc0\x9f\xa0\xbf\x31\x2b\x3c\xe3\xe2\x4c\x52\xbb\xa9\xac\x4b\x21\x1e\x36\xa9\x9b\xa4\x4c\x22\x22\x3d\xb8\xb0\xc3\x75"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xd6\xbd\xc8\x39\x25\x29\xd8\xa0\x9c\xb0\x2b\x1c\x23\xde\xa6\xa5\xbd\x3f\x39\x4f\x7d\x45\x34\x3e\xb9\xa2\xa5\xff\x21\x1c\x2d\xae\x9d\xa3\xeb\x29\x28\x3e\xca\xc5\xff\x75\xbc\xad\xb8\x39\x20\x22\x55\xa2\x9b\xab\x33\x1e\x23\x55\xad\xac\xc0\x56\x5f\xce\xe2\x37\x29\x31\xbb\x9f\x9f\xc7\x23\x1b\x29\xb9\x9f\xa4\xcc\x33\x30\x47\xea\x55\x3e\x54\xb4\xa5\xad\x3e\x1e\x1e\x3d\xa6\x9b\xa7\x3f\x23\x26\x48\xba\xb9\xd3\xf6\xc2\xb5\xc9\x31\x22\x29\xc5\x9e\x9d\xb7\x28\x1c\x27\xca\xa6\xa9\xc7\x42\x44\x7d\x6b\x3a\x2e\x3f\xb0\x9f\xa5\x4e\x1f\x1c\x32\xab\x9d\xa7\x5a\x2a\x2c\x49\xce\xde\x50\xee\xb3\xaa\xb9\x31\x1e\x22\xe6\x9f\x9c\xaf\x2e\x1e\x27\xfc\xaf\xb0"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xcd\x61\xd4\xc0\xf5\x2f\x26\x32\xb3\x9d\xa0\xdd\x21\x1c\x2d\xb4\xa1\xa9\xdf\x36\x39\x58\x6f\x40\x38\x5d\xad\xa2\xae\x36\x1d\x1e\x4b\xa3\x9c\xab\x3a\x24\x2b\x57\xbd\xc4\xfc\xdd\xb8\xaf\xce\x2c\x1f\x2a\xba\x9d\x9d\xc0\x26\x1d\x2b\xc1\xa8\xad\xd4\x49\x5d\xd5\x58\x31\x2b\x44\xac\x9e\xa7\x3f\x1d\x1d\x3a\xa9\x9e\xab\x4b\x2c\x32\x56\xdc\x54\x45\xd9\xad\xa7\xbc\x2c\x1d\x24\xc9\x9e\x9d\xb6\x2c\x20\x2c\xd9\xb2\xb9\xde\xec\xc0\xbb\x5f\x2b\x23\x36\xad\x9c\xa1\x59\x1f\x1d\x32\xb0\xa3\xad\x6e\x3a\x44\x7b\x56\x37\x33\xf9\xa9\xa0\xb0\x2f\x1c\x1f\x6c\xa1\x9d\xb0\x36\x27\x2f\x6e\xc5\xdd\x5a\xcd\xaf\xad\xdd\x28\x1e\x2c\xb2\x9c\x9e\xd0\x24\x1e\x2f\xbd"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\xab\xb4\xe6\x58\xd5\xca\x4a\x2c\x29\x4d\xa8\x9d\xa9\x37\x1c\x1e\x45\xa7\xa0\xaf\x45\x2f\x3b\x68\x6a\x40\x3e\xca\xa9\xa5\xc2\x28\x1c\x26\xbc\x9d\x9e\xbe\x2b\x22\x30\xcf\xb8\xc5\xfc\xcf\xb6\xb7\x4d\x26\x21\x3b\xa9\x9b\xa4\x45\x1e\x1e\x3a\xae\xa6\xb3\x5c\x42\x5d\xe1\x47\x2f\x30\xd4\xa5\x9f\xb5\x2b\x1b\x22\xd1\xa0\x9f\xb8\x34\x2a\x37\xee\xd5\x56\x50\xc1\xab\xab\x66\x24\x1d\x2f\xad\x9b\xa0\x71\x23\x20\x37\xbb\xae\xbd\xfd\xe9\xc0\xc5\x3f\x27\x28\x64\xa3\x9c\xac\x2f\x1c\x20\x5a\xa7\xa3\xb7\x42\x36\x47\x7e\x4c\x37\x3c\xbf\xa4\xa4\xce\x24\x1b\x29\xb5\x9d\xa0\xcc\x2a\x26\x38\xcc\xbf\xde\x6c\xc1\xaf\xb5\x40\x22\x20\x42\xa5\x9b\xa7\x3b\x1e\x20"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x44\xae\xaa\xbb\x59\x51\xd8\xdb\x3c\x2a\x2f\xc5\xa1\x9e\xbb\x27\x1b\x25\xc2\xa0\xa2\xc0\x34\x2e\x3f\xea\x68\x42\x4e\xb9\xa7\xab\x4c\x20\x1d\x35\xa9\x9b\xa4\x4d\x23\x24\x3e\xbb\xb5\xca\x7d\xca\xb8\xc4\x37\x23\x27\xd9\xa0\x9c\xb0\x2c\x1c\x23\xe2\xa7\xa7\xbe\x43\x3e\x5f\x7d\x3e\x2f\x3c\xb7\xa1\xa4\xf5\x20\x1b\x2d\xaf\x9d\xa3\xe7\x2b\x2a\x40\xce\xd0\x5a\x6f\xb8\xab\xb5\x38\x1f\x20\x52\xa2\x9b\xab\x34\x1e\x24\x54\xaf\xae\xc5\x5e\xe8\xc5\xde\x34\x27\x2f\xbb\x9e\x9f\xc5\x24\x1b\x29\xba\xa1\xa6\xcd\x36\x35\x4d\xfa\x49\x39\x4f\xb1\xa3\xab\x3e\x1e\x1d\x3c\xa6\x9c\xa8\x41\x24\x28\x4a\xbd\xbe\xe1\xeb\xbc\xb1\xc6\x30\x20\x28\xc5\x9e\x9d\xb7\x29"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# finally back to silence

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

# disable blocking

rtpe_req('unblock DTMF', 'zero DTMF block',
	{ 'from-tag' => ft(), 'delay-buffer' => 0 });

# buffer flushing

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

# sync forwarding

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;






($sock_a, $sock_b) = new_call([qw(198.51.100.1 2018)], [qw(198.51.100.1 3018)]);

($port_a) = offer('zero DTMF block w transcoding', { codec => { transcode => ['PCMA'] } }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 2018 RTP/AVP 0
c=IN IP4 198.51.100.1
a=sendrecv
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0 8
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=sendrecv
a=rtcp:PORT
SDP

($port_b) = answer('zero DTMF block w transcoding', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 3018 RTP/AVP 8
c=IN IP4 198.51.100.1
a=sendrecv
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=sendrecv
a=rtcp:PORT
SDP

$seq = 0;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
($ssrc) = rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, -1, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

# control

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\xd5\x9b\x87\x97\x64\x10\x6b\x41\xdc\x73\x66\xd1\x91\x9a\x97\x6d\x07\x04\x67\x91\x9a\x96\x5c\x60\x7d\xd3\x4d\x6b\x11\x7c\x91\x87\x9e\x4f\x1a\x04\x15\xe0\x93\xe8\xda\x59\xf1\xe4\x44\x10\x1b\x6b\xeb\x87\x85\xfc\x12\x1a\x17\xc3\xe2\xfc\x51\xc9\xeb\x96\xcb\x13\x07\x1c\xff\x85\x84\xee\x6f\x12\x68\x5c\xc5\x76\x7b\xc9\x93\x98\xef\x14\x06\x1a\x4f\x9c\x9a\x95\x77\x6c\x7f\xd7\x75\x6b\x14\x59\x9d\x87\x93\x66\x04\x04\x63\xeb\x9d\xe9\xd7\x41\xf4\xff\x71\x12\x19\x61\x91\x86\x9b\xd5\x1e\x1a\x68\xfc\xee\xff\x55\xf4\xeb\x95\x53\x1c\x04\x11\xec\x87\x85\xe5\x14\x1d\x6f\xd1\xcd\x4b\x73\xfc\x92\x9f\xfb\x12\x06\x19\xcd\x98\x9a\xef\x65\x69\x7e\x55\x77\x68"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x68\xc2\x9e\x84\x94\x6b\x07\x1a\x72\x96\x9c\xec\x59\x49\xcf\xf7\x7b\x12\x1c\x76\x9c\x86\x9f\x7c\x1a\x1a\x63\xe6\xeb\xfe\xd5\xf6\xe9\xef\x71\x19\x05\x68\x97\x86\x9b\xc2\x10\x1c\x62\xc1\xf5\x43\x49\xe4\x92\x92\xda\x1e\x06\x12\xe7\x85\x9b\xe7\x62\x6b\x7e\x55\x76\x69\x62\xf9\x98\x85\xe2\x10\x06\x18\x54\x92\x9c\xe0\x49\x76\xc7\xc3\x66\x12\x13\xd3\x98\x86\x91\x6c\x05\x1b\x79\xef\x95\xff\x54\xf6\xef\xe1\x67\x1b\x1a\x64\x9d\x86\x9e\x43\x1c\x1c\x67\xf6\xf0\x5a\x5a\xe0\x92\x91\x49\x1b\x07\x17\xeb\x84\x98\xf6\x68\x15\x7c\xd7\x76\x6c\x64\xe0\x9b\x9b\xf0\x1f\x06\x1c\xf3\x9e\x9c\xe5\x72\x72\xde\xdd\x63\x12\x17\xfd\x9a\x87\xe8\x17\x04\x1e\x41\x95"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x94\xfd\x51\xf7\xed\xfe\x6c\x1b\x19\x47\x99\x86\x93\x64\x19\x1c\x7e\xf9\xfc\x52\x57\xe2\x93\x95\x64\x05\x04\x6d\x90\x87\x9f\xd4\x17\x14\x73\xd3\x74\x63\x70\xe9\x9b\x9f\x52\x1b\x06\x11\xe3\x9b\x9d\xf1\x65\x7e\xd1\x56\x6d\x13\x69\xe3\x85\x85\xe4\x12\x07\x1d\xc7\x96\x94\xf1\x5f\xf5\xe1\xc9\x6b\x1b\x1d\xcb\x85\x86\x94\x69\x1a\x12\x49\xe7\xf9\x57\xdd\xec\x90\xe2\x6e\x04\x05\x73\x9f\x87\x93\x76\x10\x14\x77\xd8\x4b\x66\x44\x94\x9b\x93\x7e\x05\x07\x68\x94\x9a\x93\xda\x60\x7b\x54\x59\x6f\x11\x66\xeb\x84\x9a\xc6\x19\x07\x11\xf9\x93\x94\xcb\x44\xcf\xe4\xd0\x17\x1b\x16\xe6\x84\x87\xe2\x16\x05\x10\x54\xe2\xe5\xd7\xc5\xef\x96\xfb\x17\x04\x18\xd3"));
Time::HiRes::usleep(18000); $seq++;

# gap

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

# enable blocking

rtpe_req('block DTMF', 'zero DTMF block w transcoding',
	{ 'from-tag' => ft(), 'DTMF-security' => 'zero', 'delay-buffer' => 1 });

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\xd5\x9b\x87\x97\x64\x10\x6b\x41\xdc\x73\x66\xd1\x91\x9a\x97\x6d\x07\x04\x67\x91\x9a\x96\x5c\x60\x7d\xd3\x4d\x6b\x11\x7c\x91\x87\x9e\x4f\x1a\x04\x15\xe0\x93\xe8\xda\x59\xf1\xe4\x44\x10\x1b\x6b\xeb\x87\x85\xfc\x12\x1a\x17\xc3\xe2\xfc\x51\xc9\xeb\x96\xcb\x13\x07\x1c\xff\x85\x84\xee\x6f\x12\x68\x5c\xc5\x76\x7b\xc9\x93\x98\xef\x14\x06\x1a\x4f\x9c\x9a\x95\x77\x6c\x7f\xd7\x75\x6b\x14\x59\x9d\x87\x93\x66\x04\x04\x63\xeb\x9d\xe9\xd7\x41\xf4\xff\x71\x12\x19\x61\x91\x86\x9b\xd5\x1e\x1a\x68\xfc\xee\xff\x55\xf4\xeb\x95\x53\x1c\x04\x11\xec\x87\x85\xe5\x14\x1d\x6f\xd1\xcd\x4b\x73\xfc\x92\x9f\xfb\x12\x06\x19\xcd\x98\x9a\xef\x65\x69\x7e\x55\x77\x68"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x68\xc2\x9e\x84\x94\x6b\x07\x1a\x72\x96\x9c\xec\x59\x49\xcf\xf7\x7b\x12\x1c\x76\x9c\x86\x9f\x7c\x1a\x1a\x63\xe6\xeb\xfe\xd5\xf6\xe9\xef\x71\x19\x05\x68\x97\x86\x9b\xc2\x10\x1c\x62\xc1\xf5\x43\x49\xe4\x92\x92\xda\x1e\x06\x12\xe7\x85\x9b\xe7\x62\x6b\x7e\x55\x76\x69\x62\xf9\x98\x85\xe2\x10\x06\x18\x54\x92\x9c\xe0\x49\x76\xc7\xc3\x66\x12\x13\xd3\x98\x86\x91\x6c\x05\x1b\x79\xef\x95\xff\x54\xf6\xef\xe1\x67\x1b\x1a\x64\x9d\x86\x9e\x43\x1c\x1c\x67\xf6\xf0\x5a\x5a\xe0\x92\x91\x49\x1b\x07\x17\xeb\x84\x98\xf6\x68\x15\x7c\xd7\x76\x6c\x64\xe0\x9b\x9b\xf0\x1f\x06\x1c\xf3\x9e\x9c\xe5\x72\x72\xde\xdd\x63\x12\x17\xfd\x9a\x87\xe8\x17\x04\x1e\x41\x95"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
# replaced by DTMF zero
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x93\x06\x36\x09\xe5\xb5\xb4\x9d\x1a\x0f\x1a\xc0\x94\xfa\x59\xe5\x99\x98\x42\x0d\x35\x19\x87\xb6\x8b\x40\x0b\x34\x1f\x9c\x83\x9e\x54\x67\xd2\xf2\x63\x07\x07\x53\x8c\xb4\x84\x05\x36\x0a\x42\x8e\xb5\x9e\x17\x07\x10\x52\xd8\x61\x63\xed\x80\x83\xf0\x0c\x37\x01\x9e\xb6\xb5\xe5\x0d\x0b\x1e\xef\x9e\xeb\xd0\xf6\x96\x94\x6c\x0d\x0f\x60\x8c\xb6\x82\x13\x37\x35\x6c\x81\x8f\x9f\x65\x16\x7b\xd3\x61\x19\x1d\xe3\x8f\x8b\x95\x02\x31\x0c\x95\xb5\xb5\x95\x05\x02\x12\xf4\xe1\x53\x48\xe8\x87\x9a\x64\x09\x35\x13\x83\xb1\x8e\x61\x0a\x0a\x17\x9f\x86\x96\x58\x45\xe6\xfb\x14\x03\x06\xf0\x88\xb7\x99\x01\x36\x09\xf7\x8e\x88\x96\x16\x18\x6e\xd4\x73\x17\x6c\x96"));
Time::HiRes::usleep(18000); $seq++;

# gap

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
# still tone
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x8c\x82\x52\x08\x36\x04\x84\xb6\x88\xd0\x0d\x0f\x16\xee\x91\xfe\x54\xed\x9e\x97\x16\x09\x0e\x74\x89\xb6\x81\x18\x37\x08\x70\x81\x82\x97\x65\x63\xd1\xde\x14\x07\x1c\x97\x8b\x8b\xe6\x0e\x31\x03\x92\xb5\x89\xe4\x05\x06\x6a\xf5\xc7\x64\x4a\x93\x83\x85\x6a\x0a\x35\x6a\x8c\xb1\x8d\x14\x0b\x0e\x62\x9c\x9b\xe3\x5c\xfd\x94\xfb\x1c\x0f\x06\xec\xb5\xb7\x90\x02\x36\x0c\xe3\x8e\x8c\xec\x17\x10\x7d\x51\x6e\x1f\x6c\x9e\x88\x82\x65\x35\x37\x1e\x81\xb7\x8c\x72\x02\x03\x6f\xed\xe2\x57\xd3\x91\x84\x97\x1e\x0a\x0e\xcc\x8a\xb6\x85\x04\x34\x0c\xdd\x86\x87\xe2\x7f\x40\xfb\xd4\x1f\x00\x1d\x9f\xb4\x8b\xc6\x0b\x36\x07\x98\xb5\x8d\xc3\x1b\x18\x67\xc4\x7c\x6a"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

# disable blocking

rtpe_req('unblock DTMF', 'zero DTMF block w transcoding',
	{ 'from-tag' => ft() });

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;

# enable blocking

rtpe_req('block DTMF', 'zero DTMF block w transcoding',
	{ 'from-tag' => ft(), 'DTMF-security' => 'zero', 'delay-buffer' => 100 });

# pre-send 100 ms worth of audio

$rseq = $seq;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# start receiving

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

# start DTMF, interleaved with receiving older audio

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
Time::HiRes::usleep(18000); $seq++;

# still buffered silence

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
Time::HiRes::usleep(18000); $seq++;

# now replaced by DTMF zero

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x50\x92\x97\xcd\xc7\x94\x9d\xd8\x06\x08\x05\x99\xb7\xb5\xf1\x08\x37\x04\x92\x8f\x87\xc2\x6a\x66\xdf\x71\x1c\x05\x70\x81\xb5\x86\x1d\x37\x34\x60\x8f\xb4\x87\x15\x03\x1a\x75\xe4\xd0\x7e\xff\x85\x81\xe1\x00\x34\x03\x96\xb7\xb4\xea\x02\x35\x07\xe3\x84\x9c\xc8\x47\xe4\xef\x7f\x06\x0d\x6a\x81\xb7\x8c\x69\x34\x37\x11\x86\x8b\x84\x7f\x1e\x17\x45\x4d\x14\x11\xf0\x83\x89\x90\x06\x36\x09\xe4\xb5\xb4\x9d\x05\x0e\x05\xc3\x97\xe6\x52\xf8\x9f\x99\x42\x02\x0a\x19\x87\xb6\x8b\x42\x0b\x34\x1f\x9c\x82\x99\x57\x61\x53\xf1\x61\x04\x07\x50\x8d\xb4\x84\x05\x36\x0a\x43\x8e\xb5\x99\x16\x06\x12\x5d\xc2\x65\x61\xed\x81\x83\xf1\x0c\x37\x01\x9e\xb6\xb5\xfa\x0d"));
$rseq++;

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x0b\x19\xee\x98\x95\xd2\xc8\x94\x95\x6d\x02\x0f\x60\x8d\xb6\x82\x13\x37\x35\x6c\x81\x8e\x9f\x64\x11\x67\xd6\x67\x1f\x12\xe3\x8f\x88\x95\x02\x31\x0c\x95\xb4\xb5\x95\x04\x02\x1d\xf7\xe2\xd2\x4c\xee\x84\x9a\x64\x0e\x35\x13\x83\xb1\x8e\x60\x0a\x0a\x17\x9e\x86\x91\x5b\x49\xfa\xf9\x15\x00\x06\xf0\x89\xb4\x99\x01\x36\x08\xf6\x89\x88\x91\x11\x1a\x68\xd7\x75\x14\x6d\x97\x8c\x82\x5d\x08\x36\x04\x84\xb6\x88\xd1\x0d\x0f\x11\xe9\x93\xe5\x55\xe3\x9f\x94\x16\x0e\x0f\x75\x89\xb6\x86\x18\x37\x08\x71\x81\x82\x96\x64\x6c\x52\xdc\x15\x04\x1d\x97\x8b\x8b\xe6\x0e\x31\x03\x92\xb4\x88\xe7\x04\x01\x15\xf7\xca\x78\x49\x90\x80\x9a\x6a\x0a\x35\x6a\x8c\xb1\x8d"));
$rseq++;

# back to silence

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# still tone

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x14\x0a\x0e\x62\x9f\x9a\xec\x59\xf7\xea\xf9\x1d\x0c\x06\xec\xb5\xb4\x90\x02\x36\x0c\xe2\x8e\x8c\xef\x16\x13\x78\x57\x6d\x1d\x62\x9f\x89\x82\x65\x35\x37\x1e\x81\xb6\x8c\x7d\x0d\x03\x6f\xef\xee\xd2\xd3\x96\x85\x94\x1f\x0a\x0f\xcf\x8a\xb6\x85\x04\x37\x0c\xdc\x81\x86\xed\x78\x74\xfc\xd5\x1c\x00\x12\x9c\xb5\x88\xc4\x0b\x36\x07\x98\xb5\x8c\xc0\x1a\x1a\x66\xc3\x77\x69\x44\x98\x8c\x9b\x12\x34\x35\x7a\x89\xb6\x81\x12\x0b\x02\x73\x9d\x93\xf2\xd1\xef\x93\xf3\x05\x09\x07\x91\xb4\xb4\xee\x0f\x36\x00\x94\x8f\x80\xf8\x15\x6e\x52\x40\x10\x1a\x61\x84\x8a\x83\x15\x34\x37\x16\x82\xb7\x80\x63\x03\x07\x7b\xe6\xf7\x70\xce\x99\x81\xeb\x04\x34\x0c\xe3\xb4"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xb7\x9d\x01\x34\x00\xfc\x87\x9b\xff\x75\xf7\xed\x43\x05\x0d\x10\x84\xb7\x89\x72\x35\x36\x19\x84\x8a\x81\x44\x19\x13\x74\x53\x6e\x11\xd2\x86\x89\x9e\x1a\x37\x0a\xd5\x8a\xb7\x9a\x1e\x09\x06\x52\x91\xee\xd0\xf4\x93\x99\xc4\x01\x0a\x04\x99\xb6\xb5\xf2\x09\x37\x04\x90\x8d\x85\xc3\x6d\x76\xf5\x7f\x1b\x07\x7c\x80\xb4\x81\x1d\x37\x34\x63\x8c\xb4\x84\x6b\x01\x19\x4e\xf0\x77\x61\xfb\x87\x83\xe3\x00\x37\x02\x96\xb7\xb4\x95\x03\x0a\x04\xe6\x9a\x90\xc0\xd3\xee\x95\x78\x00\x0f\x14\x80\xb6\x8f\x6e\x34\x34\x11\x87\x89\x85\x73\x13\x6f\x51\x72\x13\x1d\xf3\x82\x8b\x92\x01\x36\x09\xfa\xb5\xb4\x92\x1b\x0c\x18\xc4\xe9\xf7\x43\xe6\x9a\x9a\x43\x0c\x35\x18"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x87\xb6\x8b\x44\x08\x35\x1f\x92\x80\x9c\x55\x7c\xf4\xf8\x6d\x06\x01\x5c\x8c\xb7\x84\x05\x36\x0a\x4f\x8f\x8a\x9f\x14\x05\x16\x53\x52\x6e\x6f\xef\x83\x8d\xfd\x0c\x36\x01\x9e\xb7\xb5\xe5\x02\x09\x1f\xe2\x9d\xed\xd7\xf8\x93\x96\x6f\x0c\x0e\x62\x8c\xb6\x82\x10\x34\x35\x6c\x86\x8c\x9d\x79\x6a\x77\xd9\x6c\x1a\x1f\xe2\x8e\x8a\x94\x0d\x31\x0c\xea\xb5\x8a\xea\x1a\x00\x10\xc9\xf9\x4a\x77\x95\x81\x84\x67\x08\x34\x12\x83\xb1\x8e\x66\x0b\x0b\x17\x9d\x84\x95\x5c\xd2\xec\xe4\x16\x02\x01\xf1\x88\xb7\x98\x06\x36\x09\xf5\x8f\x8e\x96\x17\x1f\x63\xd5\x65\x13\x69\x91\x8f\x8d\x51\x08\x36\x04\x84\xb6\x88\xdd\x02\x0c\x17\xed\x94\xf5\x57\xe8\x9a\x91\x11\x08"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x09\x76\x88\xb6\x81\x19\x34\x09\x73\x86\x80\x95\x79\x7a\xce\xdb\x11\x06\x1e\x97\x8a\x8a\xe0\x0e\x31\x03\x93\xb5\x8e\xe4\x1a\x04\x6e\xcc\x52\x62\x77\x9d\x82\x84\x15\x35\x34\x15\x8c\xb1\x82\x15\x08\x0f\x63\x92\x9f\xe7\x56\xe7\x91\xe4\x1f\x0e\x01\xec\xb5\xb7\x93\x02\x36\x0d\xe0\x8f\x82\xed\x15\x14\x4b\x52\x15\x18\x6e\x99\x8b\x8d\x7a\x35\x36\x1e\x81\xb7\x8c\x71\x03\x01\x6d\xe1\xe5\x42\xd2\x92\x86\x96\x19\x35\x0e\xc3\x8a\xb6\x85\x04\x34\x0d\xd0\x87\x84\xe1\x71\xd3\xe1\xd7\x19\x02\x1f\x9f\xb4\x8b\xc2\x0b\x36\x07\x99\x8a\x82\xc2\x19\x1f\x78\xd3\x66\x17\x42\x85\x8e\x85\x1d\x34\x35\x64\x89\xb6\x86\x10\x09\x03\x70\x91\x94\xcd\xc5\x97\x9e\xff"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x04\x0b\x06\x91\xb7\xb4\xe9\x0c\x37\x01\xea\x8d\x86\xff\x6f\x64\xc7\x4b\x1c\x04\x63\x87\xb5\x82\x6a\x34\x37\x16\x83\xb4\x80\x61\x01\x05\x7f\xfe\x50\x64\xca\x9a\x83\x95\x07\x34\x0f\xe0\xb4\xb7\x9d\x06\x35\x01\xf0\x85\x9c\xf1\x5f\xe6\xea\x4d\x07\x0f\x12\x84\xb7\x88\x71\x35\x37\x19\x85\x88\x86\x58\x1d\x14\x47\x4c\x17\x12\xd0\x81\x88\x98\x05\x36\x0a\x50\x8b\xb7\x9a\x1c\x0f\x04\x5d\xea\xe4\x58\xfc\x9e\x9a\xc3\x03\x35\x07\x99\xb6\xb5\xfc\x0e\x34\x05\x96\x83\x9b\xc1\x64\xd6\xfe\x65\x04\x01\x78\x83\xb4\x80\x1d\x37\x34\x62\x8d\xb5\x85\x6e\x04\x12\x40\xdb\x66\x6f\xe4\x81\x8d\xec\x03\x37\x0d\x97\xb7\xb4\x95\x00\x0b\x05\xe4\x9e\x95\xde\xca\x96"));
$rseq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x91\x7a\x02\x09\x17\x80\xb6\x8f\x6f\x34\x34\x11\x84\x8f\x9b\x77\x17\x65\xdd\x64\x1e\x1e\xf3\x8c\x8a\x9d\x01\x36\x08\xf8\x8a\xb4\x92\x19\x02\x1f\xd8\xe1\x57\x76\xed\x87\x84\x41\x0f\x34\x1b\x87\xb6\x8b\x59\x09\x35\x1d\x90\x87\x90\xd5\x44\xe7\xe6\x69\x00\x00\x5b\x8f\xb7\x87\x1a\x36\x0a\x4a\x8c\x88\x9c\x6a\x18\x6b\x56\x76\x17\x6a\xe8\x8d\x8c\xfe\x0f\x36\x00\x9f\xb7\x8a\xe4\x00\x0e\x1d\xe1\x91\xfa\x51\xe0\x9e\x93\x69\x0e\x08\x6c\x8c\xb1\x82\x11\x34\x0a\x6c\x87\x82\x93\x72\x63\xd4\xc3\x6a\x07\x18\xed\x88\xb5\x97\x0d\x31\x0c\xe8\xb5\x8b\xea\x18\x06\x17\xc1\xc0\x64\x7c\x96\x83\x87\x67\x0b\x34\x1d\x83\xb1\x8e\x64\x08\x09\x14\x90\x9b\xef\x51"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xf0\x94\xe0\x10\x0c\x03\xf6\x8b\xb7\x9b\x06\x36\x09\xcf\x8c\x8f\x94\x6a\x10\x79\x55\x6d\x1f\x15\x90\x89\x8f\xd5\x0b\x36\x04\x85\xb7\x89\xd9\x00\x02\x15\xe6\xed\xd5\x50\x97\x84\x93\x10\x0a\x08\x73\x88\xb1\x81\x1e\x34\x0e\x73\x84\x86\xe8\x71\x4d\xfa\xc1\x12\x03\x18\x96\xb5\xb5\xe3\x0e\x31\x03\x90\x8a\x8f\xe4\x1e\x1b\x63\xd8\x73\x15\x72\x9f\x8c\x87\x15\x35\x34\x14\x8c\xb6\x82\x6b\x09\x0d\x60\x91\x90\xfd\xd1\xee\x9c\xe1\x18\x08\x03\xed\xb5\xb7\x93\x03\x36\x0d\xe6\x8d\x83\xe3\x6e\x6c\x54\x59\x11\x04\x6b\x98\x8a\x8c\x7b\x35\x36\x19\x86\xb7\x8d\x74\x01\x07\x61\xfb\xcf\x7e\xdd\x9e\x80\x90\x18\x34\x09\xc4\x8a\xb6\x85\x05\x35\x02\xd4\x85\x9b"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\xe5\x43\xf2\xe8\xd1\x1a\x0c\x19\x9e\xb4\x8a\xc9\x0b\x36\x07\x9f\x8b\x83\xcd\x1d\x10\x76\x5d\x68\x13\x49\x84\x88\x84\x1d\x37\x35\x67\x8e\xb6\x86\x11\x0f\x01\x71\x94\xec\xd4\xc9\x93\x9a\xfb\x07\x35\x01\x91\xb7\xb4\xeb\x0c\x37\x01\xe9\x83\x84\xf2\x61\x49\xf3\x77\x18\x06\x6c\x86\xb4\x8d\x6a\x34\x37\x11\x83\xb4\x81\x67\x07\x19\x70\xcb\x72\x6d\xf7\x84\x8d\x97\x07\x37\x0e\xe1\xb4\xb7\x9d\x07\x0a\x06\xf7\x99\x91\xce\xde\xeb\x96\x4d\x01\x09\x1d\x84\xb6\x88\x77\x35\x37\x19\x9b\x89\x87\x5c\x11\x6c\x54\x70\x12\x1e\xd7\x83\x8a\x9a\x05\x36\x0a\x5f\x88\xb4\x9b\x1d\x0d\x1a\x5c\xed\xc9\x74\xe5\x9a\x87\xce\x02\x34\x07\x99\xb6\xb5\xfe\x0f\x34\x1a\x94"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x81\x9f\xc4\x76\xf3\xe6\x66\x06\x03\x65\x82\xb7\x80\x12\x37\x34\x6d\x82\x8a\x9a\x6d\x1a\x16\x5b\x58\x6b\x15\xe6\x83\x8f\xee\x02\x36\x0d\x97\xb4\xb4\x95\x01\x09\x1b\xf8\x93\xe2\xd4\xf9\x9d\x92\x65\x0d\x08\x16\x83\xb6\x8e\x6d\x35\x34\x11\x85\x8d\x9e\x48\x6e\x49\xc3\x63\x05\x1a\xf2\x8f\xb5\x9c\x01\x31\x08\xff\x8b\xb5\x93\x1f\x01\x12\xdc\xf3\x70\x79\xe9\x81\x86\x44\x0e\x34\x1a\x87\xb6\x8b\x52\x0e\x0b\x12\x96\x85\x94\xd4\xdb\xe8\xed\x6a\x02\x02\x46\x8e\xb6\x86\x1a\x36\x0a\x74\x8d\x89\x92\x6e\x1d\x63\x55\x64\x12\x17\xea\x8f\x8e\xfb\x0e\x36\x00\x9c\xb7\x8a\xe4\x01\x0c\x13\xe5\xeb\xce\x5f\xe9\x85\x9c\x68\x09\x0b\x6e\x8c\xb1\x8d\x16\x34\x0b"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x6c\x85\x80\x96\x74\x7c\xf6\xca\x17\x01\x05\xed\x8b\xb5\x96\x0d\x31\x0c\xee\x8a\x88\xeb\x1f\x04\x6b\xd8\x5a\x6e\x7a\x90\x8d\x81\x64\x0a\x37\x1c\x80\xb6\x8e\x7a\x0e\x0e\x15\x96\x9c\xe6\x55\xe6\x93\xec\x12\x0e\x02\xf4\x8a\xb6\x9a\x06\x36\x0e\xc0\x82\x8d\x95\x6f\x15\x4c\x54\x15\x1a\x17\x92\x8b\x8e\xd0\x0b\x36\x07\x85\xb7\x8e\xc5\x01\x01\x68\xfb\xf9\x74\x5d\x93\x81\x9c\x13\x35\x0b\x7c\x88\xb1\x81\x1f\x35\x0f\x72\x9a\x84\xed\x4e\xda\xed\xce\x1f\x0d\x1a\x96\xb5\xb5\xed\x0e\x36\x03\x91\x8b\x8c\xe5\x1d\x1c\x65\xd7\x61\x10\x79\x98\x8e\x86\x15\x34\x34\x17\x8d\xb6\x82\x69\x0f\x03\x66\x94\x95\xc3\xd9\x97\x98\xe2\x1a\x0a\x02\xed\xb4\xb7\x92\x03"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# finally back to silence

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

# disable blocking

rtpe_req('unblock DTMF', 'zero DTMF block w transcoding',
	{ 'from-tag' => ft(), 'delay-buffer' => 0 });

# buffer flushing

rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(8, 1000 + $rseq, 3000 + 160 * $rseq, $ssrc, "\x2a" x 160));
$rseq++;

# sync forwarding

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(8, 1000 + $seq, 3000 + 160 * $seq, $ssrc, "\x2a" x 160));
Time::HiRes::usleep(18000); $seq++;





new_call;

offer('RFC PT after block', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 4000 RTP/AVP 0 8 101
c=IN IP4 198.51.100.1
a=sendrecv
a=rtpmap:101 telephone-event/8000
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0 8 101
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=sendrecv
a=rtcp:PORT
SDP

answer('RFC PT after block', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 5000 RTP/AVP 8 101
c=IN IP4 198.51.100.1
a=sendrecv
a=rtpmap:101 telephone-event/8000
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 8 101
c=IN IP4 203.0.113.1
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=sendrecv
a=rtcp:PORT
SDP

answer('RFC PT after block', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 5000 RTP/AVP 8 101
c=IN IP4 198.51.100.1
a=sendrecv
a=rtpmap:101 telephone-event/8000
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 8 101
c=IN IP4 203.0.113.1
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=sendrecv
a=rtcp:PORT
SDP

rtpe_req('block DTMF', 'DTMF block',
	{ 'from-tag' => tt(), 'trigger' => '##', 'trigger-end' => '#', 'DTMF-security-trigger' => 'silence',
		'delay-buffer' => 1, 'DTMF-delay' => 2000 });

answer('RFC PT after block', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 5000 RTP/AVP 8 101
c=IN IP4 198.51.100.1
a=sendrecv
a=rtpmap:101 telephone-event/8000
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 8 101
c=IN IP4 203.0.113.1
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=sendrecv
a=rtcp:PORT
SDP




($sock_a, $sock_b) = new_call([qw(198.51.100.1 2020)], [qw(198.51.100.1 3020)]);

($port_a) = offer('PCM DTMF block', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 2020 RTP/AVP 0
c=IN IP4 198.51.100.1
a=sendrecv
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=sendrecv
a=rtcp:PORT
SDP

($port_b) = answer('PCM DTMF block', { }, <<SDP);
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio 3020 RTP/AVP 0
c=IN IP4 198.51.100.1
a=sendrecv
----------------------------------
v=0
o=- 1545997027 1 IN IP4 198.51.100.1
s=tester
t=0 0
m=audio PORT RTP/AVP 0
c=IN IP4 203.0.113.1
a=rtpmap:0 PCMU/8000
a=sendrecv
a=rtcp:PORT
SDP

$seq = 0;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# control

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
Time::HiRes::usleep(18000); $seq++;

# gap

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# enable blocking

rtpe_req('block DTMF', 'PCM DTMF block',
	{ 'from-tag' => ft(), 'DTMF-security' => 'tone', 'delay-buffer' => 1, frequencies => [250,350,450] });

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
# replaced by tone
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b"));
Time::HiRes::usleep(18000); $seq++;

# gap

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
# still tone
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b"));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# disable blocking

rtpe_req('unblock DTMF', 'PCM DTMF block',
	{ 'from-tag' => ft() });

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# enable blocking

rtpe_req('block DTMF', 'PCM DTMF block',
	{ 'from-tag' => ft(), 'DTMF-security' => 'tone', 'delay-buffer' => 100, frequencies => [250,350,450] });

# pre-send 100 ms worth of audio

$rseq = $seq;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# start receiving

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

# start DTMF, interleaved with receiving older audio

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
Time::HiRes::usleep(18000); $seq++;

# still buffered silence

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
Time::HiRes::usleep(18000); $seq++;

# now replaced by tone

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b"));
$rseq++;

snd($sock_a, $port_b,  rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b"));
$rseq++;

# back to silence

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# still tone

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b\x1b\x1b\x1d\x1e\x22\x28\x30\x3f\xff\xbf\xb0\xa8\xa2\x9e\x9d\x9b\x9b\x9b\x9d\x9e\xa2\xa8\xb0\xbf\xff\x3f\x30\x28\x22\x1e\x1d\x1b"));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;

# finally back to silence

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

# disable blocking

rtpe_req('unblock DTMF', 'PCM DTMF block',
	{ 'from-tag' => ft(), 'delay-buffer' => 0 });

# buffer flushing

rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;
rcv($sock_b, $port_a, rtpm(0, 1000 + $rseq, 3000 + 160 * $rseq, 0x1234, "\x00" x 160));
$rseq++;

# sync forwarding

snd($sock_a, $port_b, rtp(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
rcv($sock_b, $port_a, rtpm(0, 1000 + $seq, 3000 + 160 * $seq, 0x1234, "\x00" x 160));
Time::HiRes::usleep(18000); $seq++;






done_testing();
#done_testing;NGCP::Rtpengine::AutoTest::terminate('f00');exit;