[asterisk-bugs] [JIRA] (ASTERISK-28966) asterisk stuck in feed back loop changing codec

[Robert Sutton (JIRA)]

Robert Sutton created ASTERISK-28966:
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             Summary: asterisk stuck in feed back loop changing codec
                 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


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.

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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


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