Hi, I wonder which RFC defines the following escenario (AFAIK it's not
feasible with RFC 4235):
PSTN / SIP provider
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|
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[ PBX / B2BUA ]
/ | \
/ | \
[ phone A ] [ phone B ] [ phone C ]
1) The PBX receives a PSTN with callerid 12345.
2) The PBX performs some random algorithm or queue logic so "phone C"
receives the INVITE.
3) phone A has a dialog subscription to any call from PSTN and
captures the call.
I can't imagine how to do the step 3. AFAIK RFC 4235 requires a
subscription for an specific AoR, and I cannot know which will be that
AoR since it depends on the PSTN phone calling. Thisis, the INVITE the
PBX sends to phone C would be:
INVITE sip:c...@ip_c SIP/2.0
From: <sip:12...@domain>
A "solution" would be phone A subscribing to dialog presence of both
phone B and phone C, but this is not scalable (imagine 100 phones).
What I mean is that every call capture solutions I've seen are based
on subscription to an specific AoR, so when that AoR receives an
INVITE we can capture it, but what I'm looking for is a subscription
for non specific AoR, but for calls *from* a SIP device (in this case
the PBX).
How could I achieve it? any document/RFC?
Thanks a lot.
--
Iñaki Baz Castillo
<[email protected]>
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