[asterisk-dev] How cancel a call during the ringing phase?

[North Antara]

Obelix wrote:

>Is there a way to  cancel a call during the ringing phase through by monitoring
>DTMF tones during the call?
>
>I have a prepaid application working in asterisk. When the user dials a call and
>wants to cancel the call before it is answered, there is now way to do it
>without hanging up and redialling the access number.
>
>Is there way to monitor a sequence of DTMF tones and cancel the call?
>
>If I use a SIP gateway or proxy rather than dial asterisk directly will that be
>possible?
>  
>
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