Chapter 5. Exploring Gateway Control Protocols

In this chapter, you learn about the theory and configuration of the following gateway control protocols: H.323, Session Initiation Protocol (SIP), and Media Gateway Control Protocol (MGCP). The discussion begins with the most mature of these protocols, H.323.

H.323 Theory and Configuration

H.323 is not a single protocol. Instead, it is a suite of protocols. This suite specifies such things as audio/video codecs and call signaling.

You should be aware of the following two protocols used to establish an H.323 call:

  • H.225: Performs call setup and registration, admission, and status (RAS) functions

  • H.245: Performs call control, including a capabilities exchange (for example, codec negotiation)

In addition ...

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