[asterisk-bugs] [JIRA] (ASTERISK-27657) T.38 from ATA fails with hangupcause 58(Bearer capability not available)

[Jared Hull (JIRA)]

Jared Hull created ASTERISK-27657:
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             Summary: T.38 from ATA fails with hangupcause 58(Bearer capability not available)
                 Key: ASTERISK-27657
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27657
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Resources/res_fax, Resources/res_pjsip_t38
    Affects Versions: 15.2.0
            Reporter: Jared Hull


Sending a T.38 fax from an ATA is failing with hangup cause 58(Bearer capability not available) on Asterisk 15.2, but the same device and dialplan on Asterisk 14.6 works.

There are several strange things in the log:
# {{pjsip set logger on}} reports some duplicate T.38 re-INVITEs being recieved from the ATA, but a packet capture on the Asterisk server and a pcap on the SBC server relaying to the Asterisk server show that only one INVITE is there. It also looks like Asterisk is processing both
# Sometimes Asterisk sends {{491 Another INVITE transaction in progress}} in response to the T.38 re-INVITE from the ATA.
# 109 is the ATA requesting T.38, I don't know what this means.
{noformat}[Feb  5 17:39:01] DEBUG[7126][C-0000001d]: res_fax.c:3275 fax_gateway_detect_t38: T.38 disabled on channel PJSIP/109-00000060{noformat}
# Asterisk 15.2 sends an INVITE back to the ATA after receiving the ACK, but Asterisk 14.6 does not (because it has begun the fax transmission by this point).
{noformat}[Feb  5 17:39:01] DEBUG[10811]: res_pjsip_session.c:1664 ast_sip_session_refresh: Sending session refresh SDP via re-INVITE to 109{noformat}



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