Hello,
I have some queries in the below scenario :
UAC UAS
------------------- INVITE ---------------------->
(Session-Expires:3600;refresher=uac)
<------------183 Session Progress------------
-----------------PRACK ------------------------>
<------------200 OK (PRACK) ------------------
<-------------------UPDATE--------------------
(Session-Expires:3600;refresher=none)
----------------200 OK ------------------------>
(Session-Expires:3600;refresher=uac)
<--------------- 200 OK (INVITE)----------------
(Session-Expires:3600;refresher= ???)
[Query]: What should be the value of session refresher in 200 OK of INVITE?
There could be two cases:
Case 1: The value of refresher can be according to INVITE received.
* In this case if UAS sends 200 OK of INVITE with refresher value which
was in INVITE then the question is "can UAS send a different refresher in early
UPDATE?" Or we can say that "can UAS have a different negotiation for refresher
value in early UPDATE transaction and in INVITE received transaction?"
Case 2: The value of refresher in 200 OK of INVITE can be according to the
value of refresher negotiated in early UPDATE.
* In this case if UAS sends 200 OK of INVITE with refresher value which
was negotiated in early UPDATE then it will violate RFC 4028 as in fig. below :
[cid:image003.jpg@01D17A2C.3DFE22F0]
Please share your inputs for the above queries.
Thanks & regards,
Mayank Sharma
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