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Reply To: Which is better? H323/SIP?

John Joslin

Instant messaging for all!!
A whole country or company or the world on instant messaging.?I look forward to comments on this concept.
SIP is designed to be used for Presence, Instant messaging and third party call setup. Microsoft AOL etc will convert to a common SIP so I understand.With SIP if your clent stores the number you call direct peer to peer. No setup needed. Most calls will be done this way. The call can be made via E164 telephone numbers, email addresses and IP numbers. It uses ENUM to map email to E.164 tel numbers.
3G mobile will have SIP in spec. Latest has these I believe. Microsoft. IBM, Sun and all going SIP. Windows XP comes with SIP. SIP being retrofitted to Win 2000.
In a few years millions of mobiles and millions of PCs, notebooks, smartphones etc will run SIP. It is much more suitable for mobiles I read.
Envision this. Most mobiles use SIP with list of family members, workteams, club and sports contacts etc. These will be in all the clients mobile and fixed.With SIP and Presence you can see who is online and decide to contact. It is peer to peer. If they are online they answer immediately. If not still peer to peer. But must alert them on client device. Do not have to look up the number. The client Keeps it.
If all appropriate web pages ( will be XML etc by then) have contact numbers and email and with SIP will be able to see who is online and who needs to be alerted to get response. If you click to dial a call centre you will see who is available !!. Press that call button. Goes direct.Peer to peer.
In all cases if numbers are not in clients can “dial’ using E164 tel numbers or email address.Then there is third party lookup.
Having connected in any of these cases you can have a realtime text chat, ot phone call or ( with camera) can have video conference. Will be able to look at whiteboard and soon write notes. If party not there will be able to leave a voicemail or realtime email. Can also do store and forward email of course.
This all requires IP, VoIP, SIP, SDP, TCP, UDP. QoS with RSVP, DiffserV, and permanent high priority packets.Is not the QoS problem for VoIP solved. Is it now deployment.?
With instant visibility (ie presence) instant text, voice, video and written notes to anywhere anytime what can be better?. With this linked to voicemail, email, fax, and writing who needs legacy phone networks . This is far superior is it not? Given choice and if economics is right who will go for the “old”.
In South Africa there are 5million fixed line “old” phones and 12million cellphones. The cell phones are closing the digital divide. In a few more years there will be 20 million cellphones. They could well be mainly 3G with SIP and instant messaging all!!
We have about 2 million PCs. These could become SIP instant phones overnight!All the notebooks and palmtops and they will also exceed fixed line “old” phones. Furthermore one can expect cheap client server driven SIP fixed phones.
This is only the beginning. This can be integrated with XML web services.
With voiceXML the talking internet becomes possible. Not just big banks and big business but everybody will have custom IVR.
Is this possible. Where are the problems?. What is still outstanding. ? I would love you guys ( includes females) to tell me
John Joslin
South Africa