[SIPForum-discussion] Call Gets Answered During UPDATE?

[Heather Mayhan]

Qcorba,

Thanks for that info, but I knew that.  My question is more of if the messaging for the UPDATE and ANSWER seem to overlap one another.

My understanding from input yesterday is, all of the transactions to satisfy the UPDATE need to be completed before the 200 OK for the ANSWER is processed?


From: qcorba [mailto:qcorba at gmail.com]
Sent: Wednesday, February 17, 2016 23:52
To: Heather Mayhan
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] Call Gets Answered During UPDATE?

200 OK has CSeq header field which consists of a sequence number and a method.

If it is an answer, the method is INVITE.

If it is a reply to UPDATE, the method is UPDATE.

Please see RFC3261 for details.

Heather Mayhan <heather.mayhan at ericsson.com<mailto:heather.mayhan at ericsson.com>> 於 2016年2月18日星期四 寫道：
I have been trying to muddle through the question of, say you have a call IN PROGRESS, but not yet answered.

SIP UPDATE method is being used several times during the call set up, and being sent end-to-end.

What would the expected behavior be if the 200 OK indicating call ANSWER is received in between a SIP UPDATE and the corresponding 200 OK for that UPDATE?

Would the 200 OK indicating call ANSWER prevail, or should the UPDATE be acknowledged before sending on 200 OK for ANSWER?

Best regards,
Heather

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