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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

Definition
H.323 is a standard that specifies the components, protocols and procedures that provide multimedia communication services—real-time audio, video, and data communications—over packet networks, including Internet protocol (IP)–based networks. H.323 is part of a family of ITU—T recommendations called H.32x that provides multimedia communication services over a variety of networks.

Overview
This tutorial discusses the H.323 protocol standard. H.323 is explained with an emphasis on gateways and gatekeepers, which are components of an H.323 network. The call flows between entities in an H.323 network are explained, and the interworking aspects of H.323 with H.32x family protocols are discussed.