[asterisk-bugs] [JIRA] (ASTERISK-28522) chan_pjsip does not support fallback from t.38 to fax over alaw/ulaw

[Joshua C. Colp (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-28522?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joshua C. Colp updated ASTERISK-28522:
--------------------------------------

    Assignee: John Cahill
      Status: Waiting for Feedback  (was: Triage)

Can you also provide a working case from chan_sip as well as the Asterisk console output?

According to the SIP trace you've provided T.38 was never negotiated at all (the attempts were rejected), so there would be no need to re-invite back to audio because the session never changed away from audio in the first place.

> chan_pjsip does not support fallback from t.38 to fax over alaw/ulaw
> --------------------------------------------------------------------
>
>                 Key: ASTERISK-28522
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-28522
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_pjsip_t38
>    Affects Versions: 16.5.0
>         Environment:  Debian 10.0, 4.9.0-3-amd64 2GB RAM, 4 VCPUs, Xen 4.4 Dell PowerEdge R430 
>            Reporter: John Cahill
>            Assignee: John Cahill
>              Labels: fax, pjsip
>         Attachments: failed-fallback.pcap
>
>
> chan_pjsip does not support fallback from t.38 to fax over alaw/ulaw. Asterisk should re-invite to alaw/ulaw on receiving a t.38 to allow fax to proceed. This works with chan_sip.



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