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Chapter 1

Using the Cisco Voice Gateway 200

Voice over IP Overview

H.323 is a peer-to-peer protocol, helping to establish and manage connections

among H.323 endpoints. As with other peer-to-peer protocols, the many-to-many

relationships become difficult to configure and maintain in large networks. MGCP

was developed specifically to overcome the problem of scalability inherent in the

H.323 protocol.

Media Gateway Control Protocol

MGCP establishes a master-slave protocol which, when compared to H.323,

simplifies voice network administration and improves reliability and

performance. In particular, it makes configuration and administration of gateway

devices easy. With MGCP, gateways are defined by MGCP as slave devices in

relation to the master, referred to as a call agent, which manages connections

between endpoints and controls how gateways function.

Figure 1-3

MGCP

POTS phones

MGCP call agent

MGCP Gateway

PSTN

TCP/IP network

MGCP-managed endpoints

Because an MGCP gateway is a slave device, it derives most of the configuration

it requires from the call agent. To configure an MGCP gateway, all you need to do

is to identify the call agent on the gateway and identify the gateway to the call

agent. In addition, MGCP optionally supports multiple call agents, which can

eliminate a potential single point of failure in the voice network.

Software Configuration Guide for the Cisco VG200

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