Note that this topic has generated significant debate in the past, and the outcome was the early media drafts, which are now in WGLC.
http://www.ietf.org/internet-drafts/draft-ietf-sipping-early-media-01.tx t http://www.ietf.org/internet-drafts/draft-ietf-sipping-early-disposition -00.txt John Hearty Level3 > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:sip-implementors- > [EMAIL PROTECTED] On Behalf Of Attila Sipos > Sent: Wednesday, December 17, 2003 10:30 AM > To: 'Jasson Casey'; [EMAIL PROTECTED] > Subject: RE: [Sip-implementors] SDP in 180 response > > > I don't know of any explicit guidelines but use > of "180 Ringing" with SDP is certainly acceptable. > > As it says: > "This response MAY be used to initiate local ringback." > > I think this means that you can use SDP if you want > your UA to play ringback back to the caller. > > This has applications in SIP-ISDN gateways (amongst > others) where it may wish to pass back a ringback > generated by the ISDN side. > > Attila > > Attila Sipos > Software Engineer > Let's talk Business, Let's talk VoIP > www.vegastream.com > > > > -----Original Message----- > > From: Jasson Casey [mailto:[EMAIL PROTECTED] > > Sent: 17 December 2003 15:31 > > To: [EMAIL PROTECTED] > > Subject: [Sip-implementors] SDP in 180 response > > > > > > I was wondering if there explicit guidelines on whether a SDP > > can be passed in 180 responses? The only thing I came up with was: > > > > 21.1.2 180 Ringing > > > > The UA receiving the INVITE is trying to alert the user. This > > response MAY be used to initiate local ringback. > > > > 21.1.5 183 Session Progress > > > > The 183 (Session Progress) response is used to convey information > > about the progress of the call that is not otherwise > > classified. The > > Reason-Phrase, header fields, or message body MAY be used to convey > > more details about the call progress. > > > > There is no reference to body content in the 180 response, > > while there is in the 183 response. Some thoughts would be helpful. > > > > thanks, > > > > -jasson > > > > _______________________________________________ > > Sip-implementors mailing list > > [EMAIL PROTECTED] > > http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors > > > _______________________________________________ > Sip-implementors mailing list > [EMAIL PROTECTED] > http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
