[asterisk-users] Check other calls on same endpoint (validate / screen customer supplied Diversion / From header)

[Benoit Panizzon]

Hi Gang

Yes, big project on the rise to do things better / more flexible than
our existing commercial TSP switch.

During call screening process, we would like to allow customers to send
the original callingID in a attended call diversion scenario.

From the Voice Switch point of view, there are two call legs involved.
So on one call leg, I would like to check the callerID on the second
call leg. Is this doable?

Example:

Alice calls Bob who does picks up the call and puts it throught to
Charlie. Charlie shall see Alices CallerID:

Call Leg 1:
===========
Invite: Bob
From: Alice
PAI: Bob

Call Leg 2:
===========
Invite: Charlie
From: Alice
PAI: Bob
Diversion: Bob, Reason: Attended-Transfer

The screening on Leg 2 would normally not allow Alice to be sent as
Caller.
But if the sceening on Leg 2 would be able to look up Leg 1 and see the
co-existing call From: Alice To: Bob, it could allow Alice to be sent
out (and maybe add a missing Diversion and/or PAI header or also screen
the Diversion header).

Mit freundlichen Grüssen

-Benoît Panizzon-
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