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

[Kevin Harwell (JIRA)]

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

Kevin Harwell updated ASTERISK-27962:
-------------------------------------

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

We require additional debug to continue with triage of your issue. Please follow the instructions on the wiki [1] for how to collect debugging information from Asterisk. Also please include the protocol specific debug ('pjsip set logger on') captured at the time of the issue.

For expediency, where possible, attach the debug with a '.txt' file extension so that the debug will be usable for further analysis.

Thanks!

[1] https://wiki.asterisk.org/wiki/display/AST/Collecting+Debug+Information

> 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: Michael Maier
>              Labels: fax, pjsip
>         Attachments: Screenshot_20180713_155546.png
>
>
> 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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