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Party A
SIP NSE
INVITE
200 OK
SiccAnswerIntercepted
CSN
SiccAnswerIntercepted
ACK
SiccRR
SiccRS
INVITE
Stick RPID
200 OK
Stick RPID from TO, apply if not in the message
ACK
Override Stored RPID by Sticking
INVITE Pickup
SiccAnswerCall
reINVITE
Apply Stored RPID[does not show pickup number]
Copy sticked RPID from disconnecting leg and apply
200 OK
200 OK
Party B
UPDATE
UPDATE
Call Flow example for proper CLID solution (Transfer, Pickup, HO cases)
Fig. 2