Yes, I did mean 200 INVITE.
On Nov 19, 2007, at 3:22 PM, Sanjay Sinha (sanjsinh) wrote:
It is not clear from the call flow if the 200 OK is for PRACK or
INVITE?
I guess you meant 200 OK for Invite. If that is the case, I think the
RFC is clear that the answer sdp is optional in it and if it does have
an answer sdp, it MUST be idential to answer in 18x.
Really? Point me to where you find this please.
But I think the
offer-answer draft has clarified it further that it should not have
any
answer sdp. This is probably harsh in case of one offer-answer
exchange,
but makes sense if there are multiple early dialog offer-answer
exchanges in say Prack/200 OK or using UPDATE.
Sanjay
-----Original Message-----
From: Robert Sparks [mailto:[EMAIL PROTECTED]
Sent: Monday, November 19, 2007 4:14 PM
To: sip List
Subject: [Sip] SIPit21: SDP in a 200OK when using 100rel
There was a lot of discussion and disagreement at SIPit21
about whether the following 200 OK is allowed (or should) have
SDP in it:
INVITE (offer)
-------->
18x (with 100rel) (answer)
<--------
PRACK
--------->
200 OK (can this carry SDP?)
<---------
ACK
--------->
I couldn't find anything definitive in RFC form. Paul's
offeranswer draft talks about this I think.
If I understand things, the right answer here is that it's not
supposed to carry any SDP and that you should ignore it if it
shows up.
The question is, other than waste, what can go wrong if it is there?
When we end up with clear text around the requirement, will it
say SDP SHOULD NOT, or MUST NOT appear?
Or do I have this wrong?
RjS
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