Cisco 7604 Configuration Guide - Page 482
Using NAT with MGCP, RTP to 209.165.201.1, RTP to 10.0.0.76
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MGCP Inspection Chapter 22 Applying Application Layer Protocol Inspection Figure 22-11 Using NAT with MGCP To PSTN Cisco PGW 2200 H.323 209.165.201.11 M M M Cisco CallManager 209.165.201.10 Gateway is told to send its media to 209.165.200.231 (public address of the IP Phone) MGCP 209.165.201.1 SCCP 209.165.200.231 RTP to 10.0.0.76 from 209.165.200.231 209.165.200.231 GW GW RTP to 209.165.201.1 from 209.165.200.231 IP IP IP 10.0.0.76 Branch offices 119936 MGCP endpoints are physical or virtual sources and destinations for data. Media gateways contain endpoints on which the call agent can create, modify and delete connections to establish and control media sessions with other multimedia endpoints. Also, the call agent can instruct the endpoints to detect certain events and generate signals. The endpoints automatically communicate changes in service state to the call agent. MGCP transactions are composed of a command and a mandatory response. There are eight types of commands. • CreateConnection • ModifyConnection • DeleteConnection • NotificationRequest • Notify • AuditEndpoint • AuditConnection • RestartInProgress The first four commands are sent by the call agent to the gateway. The Notify command is sent by the gateway to the call agent. The gateway may also send a DeleteConnection command. The registration of the MGCP gateway with the call agent is achieved by the RestartInProgress command. The AuditEndpoint and the AuditConnection commands are sent by the call agent to the gateway. All commands are composed of a Command header, optionally followed by a session description. All responses are composed of a Response header, optionally followed by a session description. To use MGCP, you usually need to configure inspection for traffic sent to two ports: 22-66 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM OL-20748-01
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