SIP/SIMPLE is most likely to be the
most popular. MS selected it and it re-uses of existing infrastructure
(proxies etc.).
There
are standards and there are standards de facto. Where JABBER fits
in?
From practical indistry point of view H.323 UNI
solution (e.g. based GEF.3 well defined) will enable H.323 Terminal
developers to I/F with
SIMPLE based solution.
From
user point of view (He decides the future of this):
Great multimedia
and conferencing solutions (H.323) powered available IM/presence services.
"Instant messaging" in general is a really crowded
field of endeavour. The IETF had nine different protocol proposals in
fromt of it. After a heroic effort these reduced to three. Now
JABBER is attempting to expand the field again. The IETF has defined a
framework for presence and instant messaging to make it easier for all of them
to interwork. I suppose at some point we should look at how T.140 might
be brought into line with this framework.
What's the difference between "instant messaging" in general and
T.140? IOW, what can you do with one that you can't do with the
other?
Paul Long
ipDialog, Inc.