[Asterisk-Users] Transfer and Release of a call out to PSTN

[Paul Crick]

> You're looking for a feature called "Take Back and Transfer",
> TBT for short.
I thought it was Two B-Channel Transfer?

> It works by the telco always monitoring the trunks for DTMF
> from your end, for example, the TBT code might be *8. You
> would send *8,12125551212 down the line and the telco will
> pull the call back and send it to the number specified,
I guess there's more than one way to skin a cat - All the implementations
I've read use PRI signalling to make another outbound call, then sends a
command message with the CRNs of both calls and they are then bridged in the
CO switch, leaving both PRI channels free to take additional calls.

Paul