I strongly feel that IETF should define a standard where media-description is defined to propagate SIP MESSAGE as session-mode. This way small applications like synchronization of some part of my address boob with peer etc. can be developed where MSRP will be an overkill and page-mode messaging may have performance impact on the network. Any opinion on this?
On Nov 15, 2007 7:40 PM, Paul Kyzivat <[EMAIL PROTECTED]> wrote: > > > ???? wrote: > > Hi, > > I am not sure of your use case but I think your requirement could be > > achieved if you send INVITE/ACK without any content (SDP media or something > > else). This will make session hence end-to-end dialog for you. > > I beg to differ. If you send the INVITE without any content then it is > an offerless invite. In that case the UAS is obligated to send an offer > in its response. > > Of course it *could* send an offer with no media, but most UAs would > offer media in that case. And of course if it did offer you media you > could accept the call but refuse the media, which would arrive at the > same place that sending an offer with no media would. > > But if you intent going in is to establish a call with no media, then > you are better off being explicit about it. Take a case where the call > is forked to devices with different capabilities - e.g. a phone that > only does voice as well as a device that does this > session-mode/page-mode thing. If you make your offer then the phone can > refuse the call. If you make an offerless invite then it will most > likely respond. > > Paul > > > > Vipul Rastogi > > Engineer, Business Management Team > > Telecommunication Network Business > > Samsung Electronics CO, LTD > > Suwon P.O.BOX 105, 416 > > Korea 442-600 > > MO 010-9530-0354 > > ----- Original Message ----- > > From: "Vikram Chhibber" <[EMAIL PROTECTED]> > > To: <sip-implementors@lists.cs.columbia.edu> > > Sent: Wednesday, November 14, 2007 11:15 PM > > Subject: [Sip-implementors] page-mode instant-messaging question > > > > > >> Hi, > >> > >> I want to perform page-mode instant messaging (using SIP MESSAGE) on a > >> dialog created by INVITE. This INVITE I want for establishing a dialog > >> on which I can send SIP MESSAGE only and there will be no media. I do > >> not want msrp either. > >> In this case, how should I construct offer and then answer SDP? > >> SDP with no m line should be fine but is there some media description > >> defined for this purpose? > >> > >> Thanks, > >> ~Vikram > >> _______________________________________________ > >> Sip-implementors mailing list > >> Sip-implementors@lists.cs.columbia.edu > >> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > >> > >> > > > > _______________________________________________ > > Sip-implementors mailing list > > Sip-implementors@lists.cs.columbia.edu > > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > > _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
