Hi All,
Following is example call flow from RFC 3311 (SIP UPDATE Method). Is SDP a
must in the 200 OK for INVITE in this case? If it is required, then 200 OK
should contain 'answer 3'. Is this a legal behavior as answer in 200 OK for
INVITE ('answer 3') is not based on the offer in the INVITE ('offer 1').
Could anyone please explain or point me to the RFC that explains this case?
Caller Callee
(1) INVITE with offer 1
|---------------------------->|
(2) 180 with answer 1
|<----------------------------|
(3) PRACK
|---------------------------->|
(4) 200 PRACK
|<----------------------------|
(5) UPDATE with offer 2
|---------------------------->|
(6) 200 UPDATE with answer 2
|<----------------------------|
(7) UPDATE with offer 3
|<----------------------------|
(8) 200 UPDATE with answer 3
|---------------------------->|
(9) 200 INVITE (SDP ?)
|<----------------------------|
(10) ACK
|---------------------------->|
Thanks & Regards,
Subbu
_______________________________________________
Sip-implementors mailing list
[email protected]
https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
