Bala Neelakantan wrote:
Paul,
I agree that the same SDP should be sent in the subsequent non-reliable
response and also on the first Reliable response.
I guess you are shifting from the subject of the original question, and discussing a "normal" invite that includes an offer.
What if the call is forked? In that case, there could be multiple provisional responses, each could be potentially different? How does the UAC handle those?
This has been well documented and discussed, though it can get complex.
The response to each fork creates a separate dialog. It is up to the UAC to keep the different dialogs straight until one is answered and the others are cancelled.
Paul
Thanks, Neel
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Paul Kyzivat Sent: Tuesday, February 15, 2005 9:48 AM To: Steven Egan Cc: [email protected] Subject: Re: [Sip-implementors] SDP in 183 non reliable response
Well, I went back and read to refresh my memory. I agree that there is nothing that suggests SDP might be in an unreliable provisional when there had been no offer in the initial request.
If it *was* there, you wouldn't be able to consider it a true offer, since that must be in a reliable request or response. It would have to be a hint of the offer to come. I don't find any language that explicitly *prohibits* this. But in the absence of anything suggesting it might be valid you would be best to not count on it.
Paul
Steven Egan wrote:
Hi Paul,
So you are saying that when an INVITE is sent with no offer, a 183 with SDP can be sent in response?
Can you point me to where exactly this is documented please, as my problem is I cannot find anything in RFC 3261 or any other documentation
to confirm expected behaviour for the 183?
Cheers,
Steven
Paul Kyzivat wrote:
Steven Egan wrote:
Hi,
Is it valid to include the SDP in a non reliable 183 sent in response to an Invite with no initial offer?
It is ok to include the SDP in the 183 when the Invite contains the initial offer, but RFC 3261 is not clear as to whether the SDP can be included when no offer is included in the initial invite.
I believe the answer is YES. The *same* SDP should be sent in the first reliable response.
Paul
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