[asterisk-bugs] [JIRA] (ASTERISK-27962) pjsip / udptl fax passthrough fallback sometimes not working

[Asterisk Team (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-27962?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Asterisk Team updated ASTERISK-27962:
-------------------------------------

    Assignee: Asterisk Team  (was: Michael Maier)
      Status: Triage  (was: Waiting for Feedback)

> pjsip / udptl fax passthrough fallback sometimes not working
> ------------------------------------------------------------
>
>                 Key: ASTERISK-27962
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27962
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: pjproject/pjsip
>    Affects Versions: 13.22.0
>         Environment: CentOS 6 / 64 Bit
>            Reporter: Michael Maier
>            Assignee: Asterisk Team
>              Labels: fax, pjsip
>         Attachments: Screenshot_20180713_155546.png, Screenshot_20180714_163521.png, t38negerror
>
>
> A lot of the following log entries can be found in the log:
> NOTICE[20870][C-00000024] udptl.c: UDPTL (PJSIP/telekomPJSIP-226-00000050): Transmission error to 217.0.5.183:0: Invalid argument
> during receiving a fax. The receiving of the fax fails.
> This situation happens, if the following takes place (see attached screenshot):
> - inbound fax
> - t.38 udptl is activated on the incoming trunk
> - the fax device sends a t.38 reinivte
> - but the peer doesn't answer with 488 not accepted
> - instead the peer sends an INVITE "g711" (see screenshot)
> - fax reception is broken from that point.



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