[Asterisk-Dev] Sound Problem

[Asterisk DEV. Mailing List]

I had a similar problem, I never found out what caused it, but telling
asterisk 
to answer the line to the granstream before trying to dial and continue
the call 
solved the problem.

> I need a hint, how to debug this to find the source of the Problem:
> Grandstream/SIP/ULAW <-NAT-> Asterisk <-IAX2/GSM-> Asterisk <-
ISDN/CAPI -> POTS
> A Call from Grandstream to POTS leads to: POTS can speak to
Grandstream, but can't hear 
> Grandstream.
> Calling from POTS to Grandstream works well.
> Also it works well in both Calling-Directions, if i replace
Grandstream with XTEN-Lite...
> Every other Call-Combination works well, too...
> Strange, that.
>
> So if anybody has a hint, how to debug this, its welcome. ( Sorry, i
really 
> dont know, where to start debugging... )