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Party A
SIP NSE
INVITE
SiccRR
200 OK
SiccAnswerIntercepted
CSE
SiccAnswerIntercepted
ACK
SiccRR
SiccRS
INVITE
Stick PAID,PCV,PPID
200 OK
Stick PAID,PCV,PPID
ACK
Apply Stored PAID,PCV,PPID
Apply Stored PAID,PCV,PPID
INVITE HO
SiccAnswerCall
SiccTS,SiccJoin
reINVITE
Apply Stored PAID,PCV,PPID
Stick new PAID,PCV,PPID
200 OK
200 OK
Fig. 1 – Preserve Headers within a dialog
Party B