[asterisk-bugs] [JIRA] (ASTERISK-26996) choppy sound: asterisk can't decide which codec to use. Request an option to force asterisk always to use one codec in ok SDP and not a list

[Michael Maier (JIRA)]

Michael Maier created ASTERISK-26996:
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             Summary: choppy sound: asterisk can't decide which codec to use. Request an option to force asterisk always to use one codec in ok SDP and not a list
                 Key: ASTERISK-26996
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-26996
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_pjsip
    Affects Versions: 13.15.0, 13.14.1
         Environment: CentOS 6, linux 64bit 
            Reporter: Michael Maier


Asterisk initiates a call and provides more than one codec in SDP (e.g. g722, alaw, ...). The callee accepts the list of codecs in ok SDP (g722, alaw).

At this point, asterisk isn't always able to decide which codec to use later on. It frequently switches between g722 and alaw which leads to choppy sound.

But that's not always happening - it's showing up here, if the callee sends the first rtp pacakge - the problem seams not to happen, if the caller sends the first rtp package (g722) - I did multiple tests.

The attached debug output is an example of the broken situation, if asterisk can't decide what codec to use.

Goal is, to ensure, that asterisk always uses the primary codec of ok SDP list, or, maybe the better solution, just to provide one codec in SDP ok and not a list. Maybe there are other devices out there, which do have similar problems.



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