[asterisk-bugs] [JIRA] (ASTERISK-27944) res_pjsip_t38: Crash receiving 1xx responses other than 100 before 200 for T.38 reINVITE

[Richard Mudgett (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-27944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=244512#comment-244512 ] 

Richard Mudgett commented on ASTERISK-27944:
--------------------------------------------

Yes it can be put into the codebase.  However, that patch is purely defensive and does not fix the root cause.  We are apparently getting two different final responses to the T.38 reinvite transaction for that callback which appears to violate the SIP protocol.  The message does give the channel name that it happens with so you could have a better chance of narrowing down what devices or call flows are involved.

> res_pjsip_t38: Crash receiving 1xx responses other than 100 before 200 for T.38 reINVITE
> ----------------------------------------------------------------------------------------
>
>                 Key: ASTERISK-27944
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27944
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_pjsip_t38
>    Affects Versions: 15.2.2, 15.4.1
>            Reporter: Joshua Elson
>            Assignee: Unassigned
>            Severity: Minor
>              Labels: fax, patch, pjsip
>         Attachments: core.com-2018-08-01T15-46-31-0600-brief.txt, core.com-2018-08-01T15-46-31-0600-full.txt, core.com-2018-08-01T15-46-31-0600-locks.txt, core.com-2018-08-01T15-46-31-0600-thread1.txt, core.iad.2018-08-10T12-34-02-0600-brief.txt, core.iad.2018-08-10T12-34-02-0600-full.txt, core.iad.2018-08-10T12-34-02-0600-locks.txt, core.iad.2018-08-10T12-34-02-0600-thread1.txt, core.iad.com-2018-06-25T14-06-14-0600-brief.txt, core.iad.com.2018-06-25T14-06-14-0600-full.txt, core.iad.com.2018-06-25T14-06-14-0600-locks.txt, core.iad.com.2018-06-25T14-06-14-0600-thread1.txt, core.iad.com-2018-07-09T09-14-58-0600-brief.txt, core.iad.com-2018-07-09T09-14-58-0600-full.txt, core.iad.com-2018-07-09T09-14-58-0600-locks.txt, core.iad.com-2018-07-09T09-14-58-0600-thread1.txt, crash_dialplan.txt, jira_asterisk_27944_v2_w_debug_v15.patch
>
>
> Crash of Asterisk on T38 session rejection via PJSIP.
> This is happening somewhat routinely on a number of our nodes. The error message in the logs will appear as:
> [2018-06-25 14:06:04] WARNING[3368][C-00005bd3] res_fax.c: channel 'PJSIP/FC-DFW-PROXY-0000f050' refused to negotiate T.38
> There will be a crash with the attached backtrace.



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