[Asterisk-Users] Callback Application: Suggestions Please.

[Tigran Kocharyan]

Dear Asterisk Comunity,
I'm thinking about developing a callback application based on the 
following scenario:

1. Customer Calls the outgoing number which is a PSTN line connected to 
my Zap channel
2. Asterisk captures the Caller ID and calls back the customer.
3. As soon as the customer picks up the phone, asterisk plays a promt to 
enter the Destination number.
4. Asterisk Connects the Outgoing number through another channel 
(SIP/IAX/ZAP) and bridges the call.
5. After the completion, I should see the Disconnect Reason and the 
Duration for each leg of the call.

The first two steps are quite evident.
Now the trick comes on step 3. How to Dial out a number and listen for 
DTMF tones? After this, maybe park the call, or send it to conference 
room, then create the second leg of the call, then bridge the call...
Do you think Asterisk reached to a level whereas it is possible to 
achieve the solution?
Thanks for your suggestions.