[asterisk-users] Intercepting DTMF to initiate Voice Drop

[Raj Jain]

Hi,

I'm trying to implement a Voice Drop service within Asterisk
dial-plan. The service is supposed to work as following:

1. A initiates a call to B
2. The call is answered by B's answering machine
3. A hears the answering machine's greeting and the recording beep
4. A speaks a few words into the recording to personalize the message
5. A presses some DTMF keys (say, '##') to initiate Voice Drop
6. PBX intercepts DTMF and starts playing a prerecorded announcement to B
7. A is released from the call as soon as the Voice Drop is initiated
8. PBX releases the call to B at the end of the announcement


To acheive this I need to intercept DTMF in the middle of a call and
initiate an action based on that. I couldn't find an option in the
Dial() application to break out of it on receipt of a particular DTMF
sequence. Does the Dial() application support such a capability?

I've tried the 'G' option in the Dial() application but that splits
the call as soon as it is answered, whereas, I need to split the call
after it is established based on a DTMF stimulus. Are there any other
ways of accomplishing this goal?

Any thoughts, ideas?

Thank you,

Raj Jain

mailto:rj2807 at gmail dot com
sip:rjain at iptel dot org