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

[Roger Schreiter]

...
I forgot in my previous email one further issue:

Maybe the ping round trip to your SIP provider and thus
to the PSTN gateway is too long. The echo cancellation
is typically limited to a reasonable echo run time.

If the time is too long, echo cancellation will fail,
because it would be too much, in most cases unnecessary, effort.


Most DSL providers do offer "fast path" or similar things with
improved ping times (e.g. below 30 ms instead of 70 ms).


Roger.