> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:sip- > [EMAIL PROTECTED] On Behalf Of Vikram Chhibber > Sent: Thursday, November 15, 2007 6:49 PM > To: [EMAIL PROTECTED] > Cc: sip-implementors@lists.cs.columbia.edu > Subject: Re: [Sip-implementors] page-mode instant-messaging question > > Dale, the problem here is that the intention of establish INVITE > dialog is to send SIP MESSAGE only and there is no media involved. In > this case, there is no standard to define media-description in the > offer sdp for this purpose. > MSRP is encouraged for session-mode message exchanges but I think it > is a heavy and complex protocol for exchanges few light-weighted > messages. > Also, sending page-mode SIP MESSAGE have performance impact on network.
You said "for a few messages". How do you know the number that will be exchanged a priori? If it's only a few, it would arguably have no worse performance sending the Message requests by themselves than sending an Invite/1xx/200/Ack+Message/200+Bye/200. Many networks have record-routing proxies (or more). For some networks a few MESSAGE requests would be less overhead than that Invite dialog, for some not. For a lot of Message requests it would probably be better, but then that really is the use case for MSRP. [Not that I disagree with you that MSRP is heavy (it's a signaling protocol unto itself)] -hadriel _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
