For the first time on Wednesday, I noticed SIP-SIP echo...very weird.
Normally, I run G729 between all my Grandstream GXP2000 phones, but I tried X-Lite to call one of my Grandstream. This of course switched my codec over to GSM.
I had headphones on the PC and the mic muted. When I spoke in the Grandstream, I could hear a distinct echo. This even occurred with the Grandstream in another room thinking that the microphone wasn't truly muted.
I do know that the audio stream should not be echoing, and it never has with G729, but the GSM codec must have something in it.
I do not allow my phones to re-invite, so Asterisk was in the stream, but so X-Lite could be the issue. I was thinking of trying with SJPhone... just haven't had time yet.
> We have an installation with around 50 sip phones but only 5 of
> those are hardware. There are three Grandstream phones, one Snom
> and one PAP2T. We are running Asterisk 1.2.8 with an E1 (R2).
> Only the hard phones are having problems which are either echo or
> distortion. The softphones all work fine and no one is reporting
> any problems.
>
> They are using 3Com switches which are fairly new. I have really
> tried all the settings I can think of and it seems impossible that
> all 5 hard phones are defective. Obviously the customer is
> irritated because the hard phones belong to the director and the
> receptionist and they notice the problem all day. I still think
> the problem may be with the switch but I just want to check if
> anyone has had an experience like this before.
>
> --
> Carlos Chavez
> Director de Tecnología
> Telecomunicaciones Abiertas de México S.A. de C.V.
> Tel: +52-55-91169161 Ext 2001
>
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