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

[Robert Sutton (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-28966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=251428#comment-251428 ] 

Robert Sutton commented on ASTERISK-28966:
------------------------------------------

I can confirm that limiting the codec prevents the flip-flop and may have resolved some call quality issues as well.

This did not resolve our call bridging issues, although it now appears that the bridging issues may be caused by an interaction from our AGI.

> 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
>            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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