Reject the reinvite with a 488. That will cause the call to revert to
the single media stream in effect prior to the reinvite.
Paul
Neranza Bundova wrote:
> But if the UA reject the media by setting it the port to 0, there will
> be no media streams in the call. Because according to rfc 3264 :
> Existing media streams are removed by creating a new SDP with the port
> number for that stream set to zero. Removal of a media stream implies
> that media is no longer sent for that stream, and any media that is
> received is discarded. In the case of RTP, RTCP transmission also
> ceases, as does processing of any received RTCP packets. Any resources
> associated with it can be released.
>
> There is no hint in which moment the media is released. When the SDP
> offer is sent or when the SDP answer is received.
>
> Does the failure of re-INVITE means that the negotiated media stream
> still exists?
>
> -----Original Message-----
> From: Rohit Aggarwal [mailto:[EMAIL PROTECTED]
> Sent: Thursday, September 18, 2008 2:46 PM
> To: Neranza Bundova; [email protected]
> Subject: RE: reject sdp offer with multiple media lines
>
> Hi
>
> If UAC (party A) adds a new media stream in the Re-INVITE, UAS (party B)
> can always reject it by setting port to 0. UAC should release any
> resources reserved for the new stream on getting offer rejection from
> the UAS.
>
> Further, failure of Re-INVITE does not necessarily cause the call to
> fail. UAC can revert media changes to the previous state and session can
> continue with the previously negotiated media parameters.
>
> Regards
> Rohit Aggarwal
> Aricent
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of
> Neranza Bundova
> Sent: Thursday, September 18, 2008 4:48 PM
> To: [email protected]
> Subject: [Sip-implementors] reject sdp offer with multiple media lines
>
> Hi All,
>
>
>
> I am not sure how a user agent should reject an offer when:
>
>
>
> UA "A" and UA "B" are in call and they have negotiated an audio session.
>
> UA "A" sends re-INVITE request to "B" with SDP that rejects the media by
> setting the port number to 0. UA "A" adds another media to the SDP offer
> that "B" understand but can not accept.
>
>
>
> 1. When UA "A" should release the resource used for the media
> stream?
>
> a. when an sdp answer from "B" is received
> b. when "A" sends the sdp offer.
>
> 2. What B will do in this situation?
>
> a. Will send sdp answer with all media ports set to 0?
> Should B close the dialog
> b. Will send 488 response
>
> i.
> A will close the dialog
>
> ii. A
> and B will continue the dialog and will use already negotiated media
> stream
>
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