[SIPForum-discussion] Call Gets Answered During UPDATE?

[qcorba]

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> 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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