[Users] Ok, Bye..

Daniel-Constantin Mierla daniel at voice-system.ro
Sat Jul 1 23:25:36 CEST 2006


On 07/01/06 23:38, Kelvin Williams wrote:
> I am encountering a problem when creating an outbound call using our 
> PSTN Provider.
> I make the call, the phone rings (PSTN) and I can hear the other party 
> answer. They however, cannot hear me, and shortly thereafter the call 
> drops. I ngrep’d the call and found that they are sending me 200 OK’s 
> after the call is set up, and OpenSER appears to relay those back to 
> my EMTA. However, I never see the ACK return from my EMTA. What could 
> cause this problem?
your phone must send an ACK afte rreceiving the 200OK, otherwise the 
callee will tear down the call after aprox. 20sec. No audio problem 
could be if you are behind a NAT and you haven't configured the sip 
server to do the NAT traversal (via nathelper+rtpproxy or 
mediaproxy+python mediaproxy).


> Inbound calls are not a problem.
> Thanks,
> Kw
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