[asterisk-users] Echo problem in VoIP-calls

[Jonas Kellens]

Gareth,

multiple users/SIP-accounts use this asterisk server from many 
locations. Like I said: in another location with a similar setup, there 
are no echo-complaints on received or made calls.

If you say that it has nothing to do with the Cisco-router, I don't 
really know what to go looking for...

I will take your advise and try with a SIP-phone (snom 320).

What do I do if :

1. I also have echo with a SIP-phone ?
2. I do not have echo with a SIP-phone ?


Jonas.


On 06/30/2010 03:52 PM, Gareth Blades wrote:
> Thats where I believe the problem lies. You are sending audio to them
> and they are putting it onto the PSTN network. When the audio comes back
> from the PSTN it has echo on it. They are not performing echo cancellation.
> If it is an international call from the ITSP's perspective then teh
> network operator should be performing echo cancelation anyway. If its a
> national call then the telco doesnt perform echo cancelation but the
> ITSP should do it themselves. The only time this is not needed is if the
> phones have a very low delay to the ITSP but since this is normally not
> the case echo cancelation must be performed at this point.
>    
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