Yeah - that's not it - it doesn't match your assertion even.
That text says that _if_ SDP shows up in the 200, you have to ignore it.
It doesn't say anything about it matching the 18x, and it doesn't say
anything about whether the UAS is allowed to put it in the 200 in the
first place.
Btw - that passage _IS BEING USED_ to argue that it's ok, and even
_right_, to put SDP in the 200 OK since things MUST ignore it.
RjS
On Nov 19, 2007, at 6:35 PM, Sanjay Sinha (sanjsinh) wrote:
Pl. see inline...
-----Original Message-----
From: Robert Sparks [mailto:[EMAIL PROTECTED]
Sent: Monday, November 19, 2007 5:23 PM
To: Sanjay Sinha (sanjsinh)
Cc: sip List
Subject: Re: [Sip] SIPit21: SDP in a 200OK when using 100rel
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.
I was referring to sec. 13.2.1 of RFC 3261.
o If the initial offer is in an INVITE, the answer MUST be in a
reliable non-failure message from UAS back to UAC which is
correlated to that INVITE. For this specification, that is
only the final 2xx response to that INVITE. That same exact
answer MAY also be placed in any provisional responses sent
prior to the answer. The UAC MUST treat the first session
description it receives as the answer, and MUST ignore any
session descriptions in subsequent responses to the initial
INVITE.
The strengths of assertion may not be what you are looking for here.
Thanks
Sanjay
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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