asterisk users - Apr 2009 - Send Re-invite from Dialplan application?

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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On Mon, Apr 13, 2009 at 6:05 AM, Sai P. Varanasi
<saiprabhakarv at yahoo.com> wrote:
> 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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