Poul
and all,
This
is my view:
T.140
--------
T.140
is the presentation protocol for text conversation, now acknowledged to be the
standardised medium for text during a real time multimedia session in all
standardised multimedia protocols: H.320, H.324, H.323, 3G.324, SIP, and also in
V.18 text telephony, T.120 data conferencing and 3GPP mobile text
telephony.
It is
intended to be the third default medium taking video telephony into Total
Conversation.
It
gives extra value to any videophone implementation. I work daily with it and
often experience the power of the three media of video, text and voice
together.
The
media flow is character by character, so it gives a live view of the text
conversation as the thoughts are formed into typed words, just as the other real
time media carries the thoughts as they are formed into spoken words in the
audio channel or visual expressions in the video channel.
It is
Unicode based and specifies a very limited set of editing controls suitable in a
real time text conversation.
It
also forms a migration path for text telephone users into new network
environments and higher functionality communication
services.
For
each multimedia protocol, there is a specification about how a T.140 media
stream is opened and transported according to the habits in that protocol
environment.
All
call handling aspects are handled by the multimedia protocol
environment.
Services including T.140 text conversation are defined in F.703
Multimedia Conversation Service description.
----------------------------------------------------------------------------------------------------------------
Instant Messaging
---------------------------
Instant messaging is more of a complete service in its own right,
including addressing, notification, alerting, transmission etc. It is usually
regarded to be not really real time conversational. Instead it offers the
opportunity to formulate a message first and then transmit the whole message.
Some instant message services can enter a real time character by character mode.
In that mode, the user experience of the text part is usually very similar to
using T.140.
----------------------------------------------------------------------------------------------------------------
Both
have very good reasons to exist. Sometimes a real time conversation is most
effective for the purpose of developing thoughts and agreements together,
sometimes an instant message exchange is more appropriate since it does not
require the same real time devotion from the users.
Maybe
someone can brief us on the standardisation situation for Instant
messaging?
Regards
Gunnar
Hellström
-------------------------------------------
Gunnar
Hellström
Omnitor AB
Renathvägen 2
SE 121 37
Johanneshov
SWEDEN
+46 8 556 002 03
Mob: +46 708 204
288
www.omnitor.se
Gunnar.Hellstrom@Omnitor.se
--------------------------------------------
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.