[Asterisk-Users] Problems with several SIP Providers (one way echo)

[Roger Schreiter]

Alex Mosburger schrieb:
> ...
> SIPGate works also fine (better than SIPCall) but the ECHO is terrible.
> My side (* server) connected with X-Lite Softphone has a great quality,
> but the PSTN caller hears his voice with an echo.
> 
> Did anybody already had such a problem? Do you think that my * server


Hi,

I assume some accoustic feedback (speaker -> microphone) in
your headset or what else you are using, or feedback
inside your soundcard. (Some sound cards are able to feedback
PCM-in to PCM-out. In this case, check, that rec-volume for that channel
is 0!)

In both cases, the gateway to PSTN (operated by your SIP provider
or its partner) should reduce the echo notably, because they
typically run bidirectional echo cancellers.

Thus, look for a provider which combines good echo cancellation
_and_ reliable signalling! Maybe the very cheapest provider is not
the best one.


Roger.