[Asterisk-Users] SIP - Problem with audio clipping

[William M Conlon]

CLEC = Competitive Local Exchange Carrier
ILEC = Incumbent Local Exchange Carrier (aka the telephone company)
On Mar 23, 2006, at 8:52 AM, Martin Joseph wrote:

>
> 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
>
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Bill

William M. Conlon, P.E., Ph.D.
To the Point
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