[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:comment-tabpanel&focusedCommentId=244106#comment-244106 ] 

Asterisk Team commented on ASTERISK-27962:
------------------------------------------

Thanks for creating a report! The issue has entered the triage process. That means the issue will wait in this status until a Bug Marshal has an opportunity to review the issue. Once the issue has been reviewed you will receive comments regarding the next steps towards resolution.

A good first step is for you to review the [Asterisk Issue Guidelines|https://wiki.asterisk.org/wiki/display/AST/Asterisk+Issue+Guidelines] if you haven't already. The guidelines detail what is expected from an Asterisk issue report.

Then, if you are submitting a patch, please review the [Patch Contribution Process|https://wiki.asterisk.org/wiki/display/AST/Patch+Contribution+Process].

> 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
>              Labels: fax, pjsip
>
> 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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