Table of Contents:

Definition and Overview

1. What Is H.323?

2. Interworking with Other Multimedia Networks

3. H.323 Components

4. H.323 Zone

5. Protocols Specified by H.323

6. Terminal Characteristics

7. Gateway and Gatekeeper Characteristics

8. H.225 Registration, Admission, and Status

9. H.225 Call Signaling and H.245 Control Signaling

10. Connection Procedures

Self-Test

Glossary

PDF of this tutorial

Sponsored by:

• H.245 for exchanging terminal capabilities and creation of media channels
• H.225 for call signaling and call setup
• RAS for registration and other admission control with a gatekeeper
• RTP/RTCP for sequencing audio and video packets

H.323 terminals must also support the G.711 audio CODEC. Optional components in an H.323 terminal are video CODECs, T.120 data-conferencing protocols, and MCU capabilities.