asterisk users - May 2006 - "Slash Tone" at pstn cut-though?

I'm looking for a method to signal an inside extension (asterisk extension
with external dialing appl.) with a DTMF "A" tone to indicate when
Asterisk has completed dialing and the voice path  has been cut-though on a ZAP
T1 Trunk.

If this can be done, I'd also like to know if there is a method to know when
the called party has answered from the "A" and "B" Bits
state changes on the Zap T1 Port.

Thanks

Bart
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