[asterisk-bugs] [JIRA] (ASTERISK-28966) chan_pjsip: Interaction with provider re-INVITE and RTP causes codec flip-flop

[Joshua C. Colp (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-28966?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joshua C. Colp updated ASTERISK-28966:
--------------------------------------

    Assignee: Robert Sutton  (was: Unassigned)
      Status: Waiting for Feedback  (was: Triage)

Limiting the codec is for testing the underlying issue to confirm that is the cause. Once past a period of time then my analysis will have been confirmed. I don't know what the ultimate fix will be, as once accepted this would go into the queue and there is no time frame on when it would get looked at or resolved. A community member as well could pick it up and work on it.

> chan_pjsip: Interaction with provider re-INVITE and RTP causes codec flip-flop
> ------------------------------------------------------------------------------
>
>                 Key: ASTERISK-28966
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-28966
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_pjsip
>    Affects Versions: 16.10.0
>         Environment: ubuntu 18.04, docker, asterisk 16.10
>            Reporter: Robert Sutton
>            Assignee: Robert Sutton
>            Severity: Minor
>              Labels: fax, webrtc
>
> we had rtp_symmetric set to "no" on the trunk endpoint
> It seems that asterisk and our up stream sip provider got into a feed back loop as can be seen below. 
> This is just a small snippet of this, in 90 seconds this line was logged 600+ times across 3 channels.
> This was detected because the system was failing to bridge channels, it may not be the cause of failing to bridge, but either way it is a problem.
> {noformat}
> Jun 29 10:11:34 chan_pjsip.c:878 chan_pjsip_read_stream: Oooh, got a frame with format of ulaw on channel 'PJSIP/trunk-00000f60' when we're sending 'alaw', switching to match
> Jun 29 10:11:34 chan_pjsip.c:878 chan_pjsip_read_stream: Oooh, got a frame with format of alaw on channel 'PJSIP/trunk-00000f60' when we're sending 'ulaw', switching to match
> Jun 29 10:11:34 chan_pjsip.c:878 chan_pjsip_read_stream: Oooh, got a frame with format of ulaw on channel 'PJSIP/trunk-00000f60' when we're sending 'alaw', switching to match
> Jun 29 10:11:34 chan_pjsip.c:878 chan_pjsip_read_stream: Oooh, got a frame with format of alaw on channel 'PJSIP/trunk-00000f60' when we're sending 'ulaw', switching to match
> Jun 29 10:11:34 chan_pjsip.c:878 chan_pjsip_read_stream: Oooh, got a frame with format of ulaw on channel 'PJSIP/trunk-00000f60' when we're sending 'alaw', switching to match
> Jun 29 10:11:34 chan_pjsip.c:878 chan_pjsip_read_stream: Oooh, got a frame with format of alaw on channel 'PJSIP/trunk-00000f60' when we're sending 'ulaw', switching to match
> Jun 29 10:11:34 chan_pjsip.c:878 chan_pjsip_read_stream: Oooh, got a frame with format of ulaw on channel 'PJSIP/trunk-00000f60' when we're sending 'alaw', switching to match
> Jun 29 10:11:34 chan_pjsip.c:878 chan_pjsip_read_stream: Oooh, got a frame with format of alaw on channel 'PJSIP/trunk-00000f60' when we're sending 'ulaw', switching to match
> Jun 29 10:11:34 chan_pjsip.c:878 chan_pjsip_read_stream: Oooh, got a frame with format of ulaw on channel 'PJSIP/trunk-00000f60' when we're sending 'alaw', switching to match
> Jun 29 10:11:34 chan_pjsip.c:878 chan_pjsip_read_stream: Oooh, got a frame with format of alaw on channel 'PJSIP/trunk-00000f60' when we're sending 'ulaw', switching to match
> Jun 29 10:11:34 chan_pjsip.c:878 chan_pjsip_read_stream: Oooh, got a frame with format of ulaw on channel 'PJSIP/trunk-00000f60' when we're sending 'alaw', switching to match
> Jun 29 10:11:34 chan_pjsip.c:878 chan_pjsip_read_stream: Oooh, got a frame with format of alaw on channel 'PJSIP/trunk-00000f60' when we're sending 'ulaw', switching to match
> Jun 29 10:11:34 chan_pjsip.c:878 chan_pjsip_read_stream: Oooh, got a frame with format of ulaw on channel 'PJSIP/trunk-00000f60' when we're sending 'alaw', switching to match
> Jun 29 10:11:34 chan_pjsip.c:878 chan_pjsip_read_stream: Oooh, got a frame with format of alaw on channel 'PJSIP/trunk-00000f60' when we're sending 'ulaw', switching to match
> Jun 29 10:11:34 chan_pjsip.c:878 chan_pjsip_read_stream: Oooh, got a frame with format of ulaw on channel 'PJSIP/trunk-00000f60' when we're sending 'alaw', switching to match
> Jun 29 10:11:34 chan_pjsip.c:878 chan_pjsip_read_stream: Oooh, got a frame with format of alaw on channel 'PJSIP/trunk-00000f60' when we're sending 'ulaw', switching to match
> Jun 29 10:11:34 chan_pjsip.c:878 chan_pjsip_read_stream: Oooh, got a frame with format of ulaw on channel 'PJSIP/trunk-00000f60' when we're sending 'alaw', switching to match
> Jun 29 10:11:34 chan_pjsip.c:878 chan_pjsip_read_stream: Oooh, got a frame with format of alaw on channel 'PJSIP/trunk-00000f60' when we're sending 'ulaw', switching to match
> Jun 29 10:11:34 chan_pjsip.c:878 chan_pjsip_read_stream: Oooh, got a frame with format of ulaw on channel 'PJSIP/trunk-00000f60' when we're sending 'alaw', switching to match
> Jun 29 10:11:34 chan_pjsip.c:878 chan_pjsip_read_stream: Oooh, got a frame with format of alaw on channel 'PJSIP/trunk-00000f60' when we're sending 'ulaw', switching to match
> {noformat}



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