[asterisk-users] Dialing a call back out on same SIP trunk as it came in

[Tony Mountifield]

In article <20151125133008.6369360.14455.17239 at gmail.com>,
Israel Gottlieb <isrlgb at gmail.com> wrote:
> Try putting progress instead of answer

Yes, I tried Progress already, and it didn't help. But thanks for
the suggestion!

Tony

> I have a puzzling situation, and would be grateful for any insight.
> 
> I have a dialplan that forwards an incoming call out to another
> number via the same SIP trunk as it came in on. e.g.
> 
> [from-siptrunk]
> exten => 0123456789,1,NoOp
> exten => 0123456789,n,Dial(SIP/siptrunk/0987654321)
> 
> Now, if I use a different SIP trunk for the outbound call, than the
> inbound call came on, the call is set up fine - the Answer signal from the
> called party gets propagated back to the caller, and they can hear each
> other.
> 
> But if the outbound SIP trunk is the same as the one the call came in on,
> the caller doesn't hear any progress, and has no notification of when the
> call was answered. Neither can the parties hear each other.
> 
> I have tried this on two different machines using two different SIP
> providers.
> 
> However, if I change the above NoOp to be Answer(100), i.e. answer the
> inbound call before placing the outbound Dial, the caller hears progress
> and when the called party answers, they hear each other fine.
> 
> Of course, if the called party is busy, the caller just hears in-band
> busy tone, as the caller's inbound call was already answered.
> 
> Can anyone explain why I need the Answer? It feels wrong that I should.
> 
> The siptrunk entry contains canreinvite=no and directmedia=no.
> 
> The version of Asterisk on these boxes is 10.5.1, if that's relevant.
> 
> Thanks for any insight!
> 
> Cheers
> Tony
> 
> -- 
> Tony Mountifield
> Work: tony at softins.co.uk - http://www.softins.co.uk
> Play: tony at mountifield.org - http://tony.mountifield.org
> 
> -- 
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-- 
Tony Mountifield
Work: tony at softins.co.uk - http://www.softins.co.uk
Play: tony at mountifield.org - http://tony.mountifield.org