[asterisk-bugs] [JIRA] (ASTERISK-24868) Bad audio with silk if connection is bridged over third server and g722 on one side

[Peter Katzmann (JIRA)]

Peter Katzmann created ASTERISK-24868:
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             Summary: Bad audio with silk if connection is bridged over third server and g722 on one side
                 Key: ASTERISK-24868
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-24868
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_sip/General, Codecs/codec_g722
    Affects Versions: 11.16.0
         Environment: ubuntu 12
            Reporter: Peter Katzmann


We experience distorted audio in the following scenario:

3 Servers, 
Phone 1 g722
Phone 2 alaw

The call is over wan from server 1 over server 2 to server 3

If the call is direct between server 1 and server 2 audio is ok.

If i force speex (server 2 silk codec disabled) audio is ok.

It seems that server 2 does some transcoding when we use silk, because the media path says that audio goes in from silk to slin and out from slin to silk.

In opposition, when i force speex no transcoding occurs.
media path in is speex and out also.

So the question is, why does serer 2 transcode to silk instead of transparently connecting the in and out path between server 1 and server 3.




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