[asterisk-bugs] [JIRA] (ASTERISK-23262) Audio degredation with codec_dahdi and ChanSpy'ing

[Sean Bright (JIRA)]

Sean Bright created ASTERISK-23262:
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             Summary: Audio degredation with codec_dahdi and ChanSpy'ing
                 Key: ASTERISK-23262
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-23262
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Codecs/codec_dahdi
    Affects Versions: SVN
         Environment: Linux pbx-host 3.5.0-45-generic #68~precise1-Ubuntu SMP Wed Dec 4 16:18:46 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

Dell PowerEdge R620
            Reporter: Sean Bright


There are 3 channels involved in this scenario:

* {{SIP/from-internal-user/1}}
* {{SIP/from-external-user/1}}
* {{SIP/from-spying-user/1}}

The native format for all 3 of these channels is G729.

{{SIP/from-internal-user/1}} enters dialplan and goes immediately into {{MusicOnHold}}.  The {{MusicOnHold}} class consists of only .g729 files, so no encoders/decoders are used at this point.

{{SIP/from-external-user/1}} enters dialplan, and hit these three apps/functions in this order:

* {{MixMonitor(<somefile>.sln,...)}}
* {{VOLUME(RX)=2}}
* {{Bridge(SIP/from-internal-user/1,...)}}

Now, the third channel channel, {{SIP/from-spying-user/1}}, enters dialplan and goes into {{ChanSpy}}:

* {{ChanSpy(SIP/from-internal-user/1,...)}}

At this point, both {{SIP/from-internal-user/1}} and {{SIP/from-external-user/1}} begin to hear distortion/delay and are unable to understand each other.  There is also distortion/delay observed by {{SIP/from-spying-user/1}}.

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