[Asterisk-Users] SIP and echo cancel

[Philip Edelbrock]

On Dec 18, 2005, at 12:01 PM, Andrew Kohlsmith wrote:

> On Sunday 18 December 2005 14:32, Mohammad Shokuie wrote:
>> As a matter of fact im serious to know where is the source of echo  
>> in a
>> pure VoIP connection, i think the most of echo problems come from  
>> hybrid
>> circuits which are not an issue in pure VoIP sessions.
>
> Easy.  Get better endpoints.  In a pure-voip loop you have echo due to
> acoustic coupling from the earpiece to the mic, or the speaker to  
> the mic in
> a speakerphone.  Easy way to tell: in a call with bad echo, have  
> the other
> side mute.  If your echo goes away, you've got your culprit.
>
> Also note that if your transmit level is too high or they have the  
> volume up
> too loud on their end it could push the audio coupling over what  
> the design
> specifications were.

We're having some issues with a Budgetone, especially in speaker  
phone mode causing echo.  I think I read the specs have a feature  
line item of "Echo cancellation (pending)", lol.

No way to fix this other than buying new phone(s)?


Phil