[asterisk-bugs] [JIRA] (ASTERISK-28887) sendFAX fail with T.38

[Yasiru Gaminda (JIRA)]

Yasiru Gaminda created ASTERISK-28887:
-----------------------------------------

             Summary: sendFAX fail with T.38
                 Key: ASTERISK-28887
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-28887
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Resources/res_fax, Resources/res_fax_spandsp
    Affects Versions: 16.2.0
         Environment: AWS Debian GNU/Linux 10 (buster)
            Reporter: Yasiru Gaminda


sendFAX dialplan application stop responding after send OK for T.38 re-invite.

I manage to send fax using G711 without issues. Only issue is with T.38.

Debug log is like below,

{noformat}
[May 12 19:25:44] DEBUG[21084][C-00000039] pbx_variables.c: Result of 'fax_file' is '/home/admin/files/20.tiff'
[May 12 19:25:44] DEBUG[21084][C-00000039] pbx.c: Launching 'SendFAX'
[May 12 19:25:44] DEBUG[21084][C-00000039] res_fax.c: Reserving a FAX session from 'Spandsp FAX Driver'.
[May 12 19:25:44] DEBUG[21084][C-00000039] res_fax.c: Selected FAX technology module (Spandsp FAX Driver) does not support reserving sessions.
[May 12 19:25:44] DEBUG[21084][C-00000039] channel.c: Channel SIP/staging-mediagw-00000035 setting write format path: slin -> alaw
[May 12 19:25:44] DEBUG[21084][C-00000039] channel.c: Scheduling timer at (50 requested / 50 actual) timer ticks per second
[May 12 19:25:44] DEBUG[21084][C-00000039] res_rtp_asterisk.c: Ooh, format changed from none to alaw
[May 12 19:25:44] DEBUG[21084][C-00000039] res_rtp_asterisk.c: Starting RTCP transmission on RTP instance '0x7fb448015560'
...
[May 12 19:25:45] DEBUG[21084][C-00000039] chan_sip.c: T38 state changed to 3 on channel SIP/staging-mediagw-00000035
[May 12 19:25:45] DEBUG[21084][C-00000039] chan_sip.c: Done building SDP. Settling with this capability: (nothing)
[May 12 19:25:45] DEBUG[21084][C-00000039] chan_sip.c: Trying to put 'SIP/2.0 200' onto UDP socket destined for 3.105.135.109:5060
[May 12 19:25:45] DEBUG[21084][C-00000039] channel.c: Channel SIP/staging-mediagw-00000035 setting write format path: alaw -> alaw
[May 12 19:25:45] DEBUG[21084][C-00000039] channel.c: Scheduling timer at (0 requested / 0 actual) timer ticks per second
[May 12 19:25:45] DEBUG[21084][C-00000039] res_fax.c: Negotiated T.38 for send on SIP/staging-mediagw-00000035
[May 12 19:25:45] DEBUG[21084][C-00000039] res_fax.c: Requesting a new FAX session from 'Spandsp FAX Driver'.
...
[May 12 19:25:45] DEBUG[21084][C-00000039] res_fax.c: channel 'SIP/staging-mediagw-00000035' using FAX session '46'
[May 12 19:25:45] DEBUG[21084][C-00000039] res_fax.c: channel SIP/staging-mediagw-00000035 will wait on FAX fd 27
[May 12 19:25:45] FAX[21084][C-00000039] res_fax.c: FLOW T.38 Tx     0: indicator no-signal
[May 12 19:25:45] FAX[21084][C-00000039] res_fax.c: FLOW T.38 Tx     1: indicator cng
...
[May 12 19:26:28] DEBUG[21084][C-00000039] res_fax.c: Channel 'SIP/staging-mediagw-00000035' did not return a frame; probably hung up.
[May 12 19:26:28] FAX[21084][C-00000039] res_fax.c: FLOW T.30 Status changing to 'The call dropped prematurely'
[May 12 19:26:28] DEBUG[21084][C-00000039] res_fax_spandsp.c: FAX session '46' entering phase E
[May 12 19:26:28] DEBUG[21084][C-00000039] res_fax_spandsp.c: FAX session '46' completed with result: FAILED (The call dropped prematurely)
[May 12 19:26:28] FAX[21084][C-00000039] res_fax.c: FLOW T.30 Changing from state 18 to 30
[May 12 19:26:28] FAX[21084][C-00000039] res_fax.c: FLOW T.30 Changing from phase T30_PHASE_A_CNG to T30_PHASE_CALL_FINISHED
[May 12 19:26:28] FAX[21084][C-00000039] res_fax.c: FLOW T.38T Set rx type 9
[May 12 19:26:28] FAX[21084][C-00000039] res_fax.c: FLOW T.38T Set tx type 9
[May 12 19:26:28] FAX[21084][C-00000039] res_fax.c: FLOW T.38T FAX exchange complete
[May 12 19:26:28] FAX[21084][C-00000039] res_fax.c: FLOW T.30 Call completed
[May 12 19:26:28] DEBUG[21084][C-00000039] res_fax_spandsp.c: FAX session '46' is complete.
[May 12 19:26:28] DEBUG[21084][C-00000039] res_fax.c: channel 'SIP/staging-mediagw-00000035' - event loop stopped { timeout: 10000, remaining_time: 9990 }
{noformat}

Kindly request f you need more information.



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