[SIPForum-discussion] [Sip-implementors] Offer/Answer question

[Manpreet Singh]

I believe the recommended use of UPDATE for offer/answer is in early
dialog state but after 200OK, its in confirmed dialog state. But if that
limitation werent there, then it might just be valid to do it too. May
be other folks can confirm?

M

-----Original Message-----
From: kaiduan xie [mailto:kaiduanx at yahoo.ca] 
Sent: Friday, April 11, 2008 10:32 PM
To: Bob Penfield; Manpreet Singh; discussion at sipforum.org;
sip-implementors at lists.cs.columbia.edu
Subject: Re: [Sip-implementors] Offer/Answer question

Is the following case legal?

UAC                              UAS
INVITE/SDP  ------------------->
<-------------------------------- 200/SDP, UPDATE/SDP ---------------->
<------------ 200 for UPDATE/SDP
ACK(no SDP) ------------------>

There is no PRACK in the call flow.

Thanks,

kaiduan
----- Original Message ----
From: Bob Penfield <BPenfield at acmepacket.com>
To: Manpreet Singh <msingh at ibasis.net>; "discussion at sipforum.org"
<discussion at sipforum.org>; "sip-implementors at lists.cs.columbia.edu"
<sip-implementors at lists.cs.columbia.edu>
Sent: Friday, April 11, 2008 5:54:36 PM
Subject: Re: [Sip-implementors] Offer/Answer question

Yes. The 200 OK (or the 180 if using 100rel) MUST have the answer.

cheers,
(-:bob

-----Original Message-----
From: sip-implementors-bounces at lists.cs.columbia.edu
[mailto:sip-implementors-bounces at lists.cs.columbia.edu] On Behalf Of
Manpreet Singh
Sent: Friday, April 11, 2008 1:47 PM
To: discussion at sipforum.org; sip-implementors at lists.cs.columbia.edu
Subject: [Sip-implementors] Offer/Answer question

For an INVITE carrying an offer, does the offer/answer has to complete
within the INVITE transaction? Can it complete outside the transaction
but within the same dialog? Call flow is:

-------------->Invite ( offer )
<------------180 ( ringing )
<------------200OK ( empty..no offer )
------------->ACK
<------------Re-Invite ( Answer to offer in first invite )
-------------->200OK
<--------------ACK

M
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