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

[Alex Mosburger]

Thanks fort he fast feedback Roger!

It is not my end hearing or producing echo. My voice is heard correctly
without any echo, but the other side hears his OWN voice several msec
later... MMhhhh... a switch to another provider is in this case a good
idea... ;)

Alex

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Roger
Schreiter
Sent: Sonntag, 16. April 2006 18:35
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] Problems with several SIP Providers (one
wayecho)

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.

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