[asterisk-bugs] [JIRA] (ASTERISK-29104) Jitter buffers accumulate on channel

[Robert Sutton (JIRA)]

Robert Sutton created ASTERISK-29104:
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             Summary: Jitter buffers accumulate on channel
                 Key: ASTERISK-29104
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-29104
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: pjproject/pjsip
    Affects Versions: 16.13.0, 16.11.1
         Environment: Ubuntu 18.04, Docker
            Reporter: Robert Sutton
            Severity: Minor


It seems that a PJSIP channel spanning multiple bridges where jitter buffer is enabled on it between each bridge has accumulating lag (abount 250ms per call) and eventually, after about 10 bridges no audio will pass.

This is the command being used
      Set(JITTERBUFFER(adaptive)=500,,100)

The process:

The Primary channel is brought up via manager Originate and placed into dial plan where jitter buffer is enabled and then on to AGI.

A second channel is brought up via manager Originate and jitter buffer is enabled and placed into AGI via dial-plan.

AGI on the second channel then bridges the two channels, when the second channel hangs up the Primary channel returns to dial-plan where jitter buffer is enabled again and then on to AGI to wait for another channel to be bridged.

With each successive cycle the audio delay increases, and after about 10 cycles audio only passes intermittently.

This can be mitigated by using a channel variable on the Primary channel and ensuring that jitter buffer is enabled only once during it's life.

I've tried to reproduce this using only dial plan but am not able to, I'd like to be able to provide some useful diagnostic information but there doesn't seem to be any ability to log jitter buffer behavior?

Please suggest how to capture diagnostic information.



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