RE: [Sip-implementors] SDP in 1xx response when no SDP in INVITE

[Jonathan Rosenberg]

No doubt that if the INVITE has an SDP, the provisional can have an SDP. What the semantics of this are is the subject of some debate. Some clear semantics are defined in the manyfolks resource draft, for example. But, its usage for "early media" is still the subject of some debate that needs resolution soon. If the INVITE does not have SDP, these two statements are contradictory. Whether or not the SDP is allowed is really secondary, in this case, to the semantics of what is meant by the SDP in the provisional response. This is again part of the broader open issue on early media that needs to take place. I've flagged this as contradictory, for resolution once those issues are sorted out. -Jonathan R. --- Jonathan D. Rosenberg 72 Eagle Rock Ave. Chief Scientist First Floor dynamicsoft East Hanover, NJ 07936 [EMAIL PROTECTED] FAX: (973) 952-5050 http://www.cs.columbia.edu/~jdrosen PHONE: (973) 952-5000 http://www.dynamicsoft.com > -----Original Message----- > From: Bob Penfield [mailto:[EMAIL PROTECTED]] > Sent: Friday, March 09, 2001 8:41 AM > To: [EMAIL PROTECTED]; Takumi Ohba > Subject: Re: [Sip-implementors] SDP in 1xx response when no > SDP in INVITE > > > Yes, they are contradictory. I agree with you that 4.2.1 is > the right thing > to do. 4.2.1 has a MAY in it and 7.1 says "..can only..." > instead of MUST > NOT. The BIS draft probably should have 7.1 corrected or > modified to use > appropriate requirements language. > ----- Original Message ----- > From: "Takumi Ohba" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Thursday, March 08, 2001 8:14 PM > Subject: Re: [Sip-implementors] SDP in 1xx response when no > SDP in INVITE > > > > Hello, > > > > I wuold have confirmed the following point first; > > Are the two sentences I referred in my first mail > contradictory, or not? > > > > In my understanding, when no SDP in INVITE, > > - The former allows SDP in 1xx response. > > - The latter does not allow it. > > > > If my understanding is acceptable, let's go to the second point; > > Which is correct? > > > > Regards, > > Takumi > > > > > > At 5:04 PM +0200 01.3.8, Christer Holmberg wrote: > > > Hi, > > > > > > >I think the key word here is "provisional", which makes > the difference. > > >>Agree? > > > > > > No. "Provisional" and "1xx" is the same thing. > > > > > > Regards, > > > > > > Christer Holmberg > > > Ericsson Finland > > > > > > > > > > > Chris > > > > > > > > Takumi Ohba wrote: > > > > > > > > > Dear all, > > > > > > > > > > May 1xx response include a session description when a > corresponding > INVITE > > > > > did not contain a session description? > > > > > > > > > > According to 2543bis02; > > > > > - In the second paragraph of 4.2.1 > > > > > "In this case, the UAS SHOULD still return a session > description in > its > > > > > informational (1xx) or success (2xx) response, > containing those > media > > > > > streams and codecs it supports." > > > > > > > > > > - In the second paragraph of 7.1 > > > > > "Thus, the UAS can only include a session description in its > provisional > > > > > response if the UAC has included one in an earlier INVITE." > > > > > > > > > > These two sentences seem contradictory for me, > because the former > allows > > >the > > > > > inclusion of SDP in 1xx but the latter does not. > > > > > I believe the former is correct. > > > > > > > > > > Regards, > > > > > Takumi Ohba > > > > > > > > > > *************************************************** > > > > > Takumi OHBA > > > > > NTT Network Service Systems Laboratories > > > > > tel +81 422 59 4405 fax +81 422 59 3494 > > > > > e-mail [EMAIL PROTECTED] > > > > > *************************************************** > > > > > > > > > > _______________________________________________ > > > > > 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 > > > Content-Type: text/x-vcard; charset=us-ascii; > > > name="christer.holmberg.vcf" > > > Content-Transfer-Encoding: 7bit > > > Content-Description: Card for Christer Holmberg > > > Content-Disposition: attachment; > > > filename="christer.holmberg.vcf" > > > > > > 添付書類を変換 : Macintosh HD:christer.holmberg.vcf 125 > (TEXT/ttxt) (00043611) > > > > > > *************************************************** > > Takumi OHBA > > NTT Network Service Systems Laboratories > > tel +81 422 59 4405 fax +81 422 59 3494 > > e-mail [EMAIL PROTECTED] > > *************************************************** > > > > > > _______________________________________________ > > 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