Gateway Protocols
Introduction
In this section, you learn about the theory and configuration of the following gateway control protocols: H.323, SIP, and MGCP. The discussion begins with a generic overview of gateway protocols.
Gateway Protocol Theory
The ultimate goal of call control is to allow RTP streams to flow directly between endpoints. Therefore, during the call setup process, each endpoint (for example, IP phone) needs to learn the IP address and UDP port to use to get a phone call to the other end.
In addition to setting up a call, you might want to perform call administration and accounting features. These features can keep track of bandwidth usage on the WAN and maintain call records, which you can use for billing or planning purposes. ...
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