[Asterisk-Users] SIP - Problem with audio clipping

[Martin Joseph]

On Mar 23, 2006, at 8:00 AM, Michael Welter wrote:

> Using a SIP connection with a CLEC, the downstream (received) audio is 
> perfect when the mute button is activated on the phone.  However, when 
> there is upstream audio (i.e., talking or even breathing into the 
> microphone), the downstream audio is cut off.  It's kinda like having 
> a half-duplex audio connection.
>
> When I divert outgoing calls to another provider, these calls are 
> fine.  However, the inbound calls from the CLEC continue to have 
> clipped audio.
>
> This happens with Polycom, Cisco, and Grandstream phones, so I don't 
> believe it's a phone problem.
>
> I have this problem with two different Asterisk system using the same 
> CLEC.  One is * v1.2.4 and the other is v1.2.5.  The systems have 
> totally different motherboards.
>
> Has anyone had a similar problem, and what was the cause?

I don't even know what CLEC is, so take my advice with a big block of 
salt.

Perhaps an echo can is causing this?  Can you try disabling any echo 
cancelers as a test?

Marty