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CAPI Call Deflection

While an incoming CAPI call is alerting it can be forwarded to another ISDN destination.
This keeps the caller ID correct (if you try the same with a Dial command you'll have to use your MSNs
as the caller ID) and it needs no B channel.
So you could use this to deflect calls when your B channels are all busy.

exten => s,1,Wait(1)
exten => s,2,capiCD(12345678)
exten => s,3,Hangup

This will forward any incoming call (in that context) to the ISDN number 12345678.
Note the Wait(1) at prio 1, this is needed because it takes a short time to receive all the CAPI messages.

Call deflection can be very useful combined with call forwarding (in the Asterisk dialplan) to forward incoming
calls to a mobile phone and still see the original caller ID on the display (see Call Forwarding).

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