Cisco 7604 Configuration Guide - Page 481
MGCP Inspection, MGCP Inspection Overview
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Chapter 22 Applying Application Layer Protocol Inspection MGCP Inspection MGCP Inspection This section describes how to enable and configure MGCP application inspection and change the default port configuration. This section includes the following topics: • MGCP Inspection Overview, page 22-65 • Configuring MGCP Call Agents and Gateways, page 22-67 • Configuring and Enabling MGCP Inspection, page 22-67 • Configuring MGCP Timeout Values, page 22-69 • Verifying and Monitoring MGCP Inspection, page 22-69 • MGCP Sample Configuration, page 22-70 MGCP Inspection Overview MGCP is a master/slave protocol used to control media gateways from external call control elements called media gateway controllers or call agents. A media gateway is typically a network element that provides conversion between the audio signals carried on telephone circuits and data packets carried over the Internet or over other packet networks. Using NAT and PAT with MGCP lets you support a large number of devices on an internal network with a limited set of external (global) addresses. Examples of media gateways are as follows. • Trunking gateways that interface between the telephone network and a VoIP network. Such gateways typically manage a large number of digital circuits. • Residential gateways that provide a traditional analog (RJ11) interface to a VoIP network. Examples of residential gateways include cable modem/cable set-top boxes, xDSL devices, broad-band wireless devices. • Business gateways that provide a traditional digital PBX interface or an integrated soft PBX interface to a VoIP network. MGCP messages are transmitted over UDP. A response is sent back to the source (IP address and UDP port number) of the command, but the response may not arrive from the same address as the command was sent to. This can happen when multiple call agents are being used in a failover configuration and the call agent that received the command has passed control to a backup call agent, which then sends the response. Figure 22-11 illustrates how NAT can be used with MGCP. OL-20748-01 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM 22-65
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