what is Sue's device? Also pjsip? Have you tried replacing it with
another client?
klaus
Am 21.12.2010 17:34, schrieb Ken Laberteaux:
> I am trying to work with a developer to troubleshoot echo issues in a
> mobile-phone SIP application (csipsimple).
>
> If I recall from my telecom days, there was sometimes a practice of
> intentionally feeding back some of the received signal. This was done
> to give the far-end talker a nice "reverb" sound to his voice, but is
> a disaster if there is delay in the line.
>
> Is there anything like this in pjsip?
>
> Again, the issue is that a far-end caller (call him Frank) calls the
> near end SIP device using pjsip (call her Sue), Frank experiences
> significant echo of his voice. Sue experiences no echo of her voice.
> It seems that Frank's echo problems are not reduced even when Sue
> covers her mic with her finger ("acoustic mute") while Frank talks.
> This leads me to think that Frank's voice is being resent (digitally,
> not acousticly) to Frank by Sue's device. Since there is non-trivial
> delay in the round trip, Frank hears significant echo.
>
> Any suggestions?
>
> Thanks!
>
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