H.323 is still widely used for voice transit, though most major carriers are, indeed, putting focus on SIP. It’s taking forever. Whereas we were able to deploy H.323 in relatively short order, SIP — which was introduced only months after H.323 — has taken forever. It’s got a lot of interoperability issues, which largely stem from the fact that it’s the Swiss Cheese of protocols, sometimes referred to as the Subject to Interpretation Protocol. :-)
Going forward? Will SIP be the future? I have my doubts. SIP is a dinosaur now and there is a growing focus on newer and better technologies.
One is XMPP, which has a proven ability to handle IM/presence, voice, and video. Another is H.325, which is a new XML-based protocol under development that will enable a user to use multiple devices in parallel and use any number of applications within a session. This is something that neither H.323 nor SIP did very well. For now, H.323 leads in the videoconferencing space, SIP is replacing the old PSTN with “PSTN over IP”, and the future looks like it will be something entirely different. Is H.323 dead? | LinkedIn Answers | LinkedIn
* The person I think I am
* The person you think I am
* The person I actually am
* The person you think you are
* The person I think you are
* The person you really are GrumpyStorage: Communication maths or the little voices in my head?