Can Any one point out some advantages of SIP, that why we need SIP in application like Video Conferencing, which we can't get without it. Though some of them I think are,
- To make a consensus between the the user of application/system, over the characteristic of media to be used in conference.
- Call making would be transparent, like either caller or callee can be a Desktop application, IP telephone, PSTN user etc.
- Maintains state about session being establish for some features like billing etc.
- Locating prospective session participants.
Can any body add some more features, or make any comments. Any effort will be appriciated.