Voice and Video Conferencing Fundamentals

Chapter 6. Signaling Protocols: Conferencing Using H.323

This chapter covers the following topics:

• H.323 overview

• H.323 endpoint aliasing

• H.225 call signaling

• H.245 control protocol

• H.323 Empty Capability Set

• H.323 device types

• H.323 gatekeeper services

• Using service prefixes with MCUs

Although multimedia conferencing is migrating toward SIP signaling, as described in Chapter 5, “Signaling Protocols: Conferencing Using SIP,” many organizations continue to have a significant investment in legacy H.323 endpoints. This chapter provides a general overview of basic H.323 signaling concepts.

H.323 Overview

H.323 is a widely deployed International Telecommunication Union (ITU) standard, originally established in 1996. It is part of the H.32x series of protocols ...