This article is presented by:Melinda Shore
Nokia IP Telephony

IP Telephony Protocols and Architectures

Why give this talk?

Telecommunications and telephony are undergoing a radical change
The trade press is full of the news that telecommunications and telephony are undergoing a radical change
Information about the technology underlying these changes is not readily available

Agenda

Overview
Scenarios
Basic components of an IP telephony system
Standards and standards bodies
H.323 101
Decomposing gateways (more components! more protocols!)
Security (H.235)
Numbering, addressing
Wrap-up
Various breaks for questions


Caveats

Not talking much about
Mobility
Wirelessness
Multipoint/multiparty architecture
SIP deserves a lot more attention than it’s going to get today
So does the PSTN switching hierarchy

IP Telephony - What is it?

Several things, actually
Widely used end-to-end, very often with video
NetMeeting
iVisit
CU-Seeme
Increasingly popular to provide a gateway to traditional switched circuit networks
Low-cost long distance services by trunking calls over an IP network
Replace a PBX or key system with telephony on a LAN within an enterprise
“IP Centrex”
Call centers (CTI)
Screen pops
Predictive dialers
These usually use APIs and toolkits (TAPI, JTAPI, IBM CallPath)
The protocols and architectures we’re talking about today cover all of these



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