[asterisk-users] Send Re-invite from Dialplan application?

[Sai P. Varanasi]

Hi,
  I have a requirement where an IVR application on asterisk has
to play a audio file in g729 and when a digit is pressed, the call
should switch to another codec (say ulaw). So, What can I do in the
extensions.conf to trigger a re-negotiation of codec?

I used 
exten => 55xx,n,Set(SIP_CODEC=ulaw)

but, I suppose this affects the next call and not the current one.

Please help ASAP

Thanks,
Sai


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