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The following is a short excerpt from the Supra Fax documentation.
----------------------------------------------------------------------------
7.4.10 +FHNG:, CALL TERMINATION WITH STATUS
Syntax: +FHNG:<hangup status code>
+FHNG indicates that the call has been terminated. The hangup cause is
reported and stored in the +FAXERR parameter for later inspection. The
<hangup status code> values are described in Table 7-5.
+FHNG:<hsc> is a possible intermediate result code to any DTE action
command described in Section 7.3. It is always followed by the OK final
result code.
Upon termination of a call, the DCE determines the cause of termination
and reports it as part of the FHNG:<hsc> response. It also stores this
<hsc> code in the +FAXERR parameter for later inspection.
The hangup values are organized according to the phases of the facsimile
transaction as defined by T.30. A COMREC error or RSPREC error
indicates that one of two events occurred. 1) a DCN (disconnect) signal
was received, or 2) an FCS error was detected and the incoming signal
was still present after 3 seconds.
The table values are in decimal notation. Leading zero characters are
optional.
Table 7-5 Hangup Status Codes
|------------------------------------------------------------|
| Code | Cause Description |
|----------|-------------------------------------------------|
| 0-9 | CALL PLACEMENT AND TERMINATION |
|----------|-------------------------------------------------|
| 0 | Normal and proper end of connection |
| 1 | Ring Detect without successful handshake |
| 2 | Call aborted, from +FK or AN |
| 3 | No Loop Current |
|----------|-------------------------------------------------|
| 10-19 | TRANSMIT PHASE A & MISCELLANEOUS ERRORS |
|----------|-------------------------------------------------|
| 10 | Unspecified Phase A error |
| 11 | No Answer (T.30 T1 timeout) |
|----------|-------------------------------------------------|
| 20-39 | TRANSMIT PHASE B HANGUP CODES |
|----------|-------------------------------------------------|
| 20 | Unspecified Transmit Phase B error |
| 21 | Remote cannot receive or send |
| 22 | COMREC error in transmit Phase B |
| 23 | COMREC invalid command received |
| 24 | RSPEC error |
| 25 | DCS sent three times without response |
| 26 | DIS/DTC received 3 times; DCS not recognized |
| 27 | Failure to train at 2400 bps or +FMINSP value |
| 28 | RSPREC invalid response received |
|----------|-------------------------------------------------|
| 40-49 | TRANSMIT PHASE C HANGUP CODES |
|----------|-------------------------------------------------|
| 40 | Unspecified Transmit Phase C error |
| 43 | DTE to DCE data underflow |
|----------|-------------------------------------------------|
| 50-69 | TRANSMIT PHASE D HANGUP CODES |
|----------|-------------------------------------------------|
| 50 | Unspecified Transmit Phase D error |
| 51 | RSPREC error |
| 52 | No response to MPS repeated 3 times |
| 53 | Invalid response to MPS |
| 54 | No response to EOP repeated 3 times |
| 55 | Invalid response to EOM |
| 56 | No response to EOM repeated 3 times |
| 57 | Invalid response to EOM |
| 58 | Unable to continue after PIN or PIP |
|----------|-------------------------------------------------|
| 70-89 | RECEIVE PHASE B HANGUP CODES |
|----------|-------------------------------------------------|
| 70 | Unspecified Receive Phase B error |
| 71 | RSPREC error |
| 72 | COMREC error |
| 73 | T.30 T2 timeout, expected page not received |
| 74 | T.30 T1 timeout after EOM received |
|----------|-------------------------------------------------|
| 90-99 | RECEIVE PHASE C HANGUP CODES |
|----------|-------------------------------------------------|
| 90 | Unspecified Receive Phase C error |
| 91 | Missing EOL after 5 seconds |
| 92 | Unused code |
| 93 | DCE to DTE buffer overflow |
| 94 | Bad CRC or frame (ECM or BFT modes) |
|----------|-------------------------------------------------|
| 100-119 | RECEIVE PHASE D HANGUP CODES |
|----------|-------------------------------------------------|
| 100 | Unspecified Receive Phase D errors |
| 101 | RSPREC invalid response received |
| 102 | COMREC invalid response received |
| 103 | Unable to continue after PIN or PIP |
|----------|-------------------------------------------------|
| 120-255 | RESERVED CODES |
|------------------------------------------------------------|
|
