[Asterisk-Users] callback with 3 way call?

[Jet Bagadion]

i'm new with asterisk. i currently have 1 fxo port. my phone
line connected to the fxo is capable of 3 way calls using flash.
i'm thinking of a callback and then 3 way call from asterisk. is
this possible?

1. phone1 calls asterisk thru zap/fxo. asterisk gets callerid of
phone1.
2. asterisk will callback phone1 using zap/fxo. 
3. phone1 answers and is prompted for a number to call.
4. phone1 dials a number.
5. asterisks intiates a flash on zap/fxo. dials the number and
then flash again zap/fxo for 3way call.

i saw callback scripts but haven't found a sample script to do a
flash and dial the number. i tried doing callback, flash, dial
and flash but didn't work. tried callback, flash, senddtmf, and
flash and didn't work either. any tips?

thanks.

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