asterisk users - Jun 2013 - No audio until you put call on hold...

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	I have been struggling with an audio issue for a week now and have
not been able to solve it.

	We have an Asterisk server (now running 11.4 but started with 1.8)
with several sip phones on an internal network and a SIP trunk for
external calls.  We recently put several phones in service that
connect via the Internet to the server.  All NAT settings and port
configurations were done and all phones register.  The problem we have
is that when external phones dial a pstn number they get no audio.  We
found that if you dial and put the call on hold for a couple second
you then get audio on the call.

	I really do not know what else I can check in the configuration.  Why
would putting the call on hold get the audio flowing?  Any ideas or
recommendations?

- -- 
Telecomunicaciones Abiertas de M?xico S.A. de C.V.
Carlos Ch?vez Prats
Director de Tecnolog?a
+52-55-91169161 ext 2001
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Carlos Chavez wrote:
>
> I have been struggling with an audio issue for a week now and have
> not been able to solve it.
>
> We have an Asterisk server (now running 11.4 but started with 1.8)
> with several sip phones on an internal network and a SIP trunk for
> external calls.  We recently put several phones in service that
> connect via the Internet to the server.  All NAT settings and port
> configurations were done and all phones register.  The problem we have
> is that when external phones dial a pstn number they get no audio.  We
> found that if you dial and put the call on hold for a couple second
> you then get audio on the call.
>
> I really do not know what else I can check in the configuration.  Why
> would putting the call on hold get the audio flowing?  Any ideas or
> recommendations?

Carlos,

Please provide SIP traces of both call legs (external phone to Asterisk and
Asterisk to SIP trunk) annotated to show when the audio starts as well as the
CLI output of 'sip show settings', 'sip show peer <external
phone>', and 'sip
show peer <SIP trunk>'.

Regards,

Matthew Roth
InterMedia Marketing Solutions
Software Engineer and Systems Developer