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

[Alex Mosburger]

Hi! 

First I want to say hello to the complete list. I am new and I have a
problem, where I did not find an answer in the archives and on 
voip-info.org ...

I am subscribed to two SIP Providers:
1. SIPCall.at
2. SIPGate.at

SIPCall works fine with signalling (incoming and outgoing calls), but
the connections terminates without any feasible error. In addition there
is also a minor echo on the line.

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
config (sip.conf) is the problem (but internally everything works
great!) or is that a Provider issue?

Thanks for your help,
Alex