[asterisk-bugs] [JIRA] (ASTERISK-28865) FAX T.38 re-Invite failed on '491 Another INVITE transaction in progress'

[Alexei Gradinari (JIRA)]

Alexei Gradinari created ASTERISK-28865:
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             Summary: FAX T.38 re-Invite failed on '491 Another INVITE transaction in progress'
                 Key: ASTERISK-28865
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-28865
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Resources/res_pjsip_session, Resources/res_pjsip_t38
    Affects Versions: 16.10.0
            Reporter: Alexei Gradinari
         Attachments: fax_491.txt

On call between 2 PJSIP endpoints when fax tone is detected simultaneously by both endpoints there may be a case when both endpoints send T.38 re-Invite to the asterisk.
One of this re-Invite is rejected by the asterisk with "491 Another INVITE transaction in progress".
After that the asterisk no longer allows to negotiate T.38 on this session.

There are strange reply/Invite from the asterisk with SDP line "m=audio 0 RTP/AVP 0 8"

Attached SIP flow file 'fax_491.txt'




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