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<H2>5 Transport mechanisms</H2>
<A NAME="5.1"><!-- Empty --></A>
<H3>5.1 Callback interface</H3>
<P>The callback interface of the transport module contains several
functions. Some of which are mandatory while others are only
optional:
<P>
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<LI>
<CODE>send_message</CODE> - Send a message. <STRONG>Mandatory</STRONG><BR>
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<CODE>block</CODE> - Block the transport. <STRONG>Optional</STRONG><BR>
This function is usefull for flow control.<BR>
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<CODE>unblock</CODE> - Unblock the transport. <STRONG>Optional</STRONG><BR>
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<P>For more detail, see the
<A HREF="megaco_transport.html">megaco_transport</A>
behaviour definition.<A NAME="5.2"><!-- Empty --></A>
<H3>5.2 Examples</H3>
<P>The Megaco/H.248 application contains implementations
for the two protocols specified by the Megaco/H.248 standard;
UDP, see <A HREF="megaco_udp.html">megaco_udp</A>,
and TCP/TPKT, see <A HREF="megaco_tcp.html">megaco_tcp</A>.
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