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Chapter 1

Using the Cisco Voice Gateway 200

These ports can be used to integrate a VoIP network with POTS devices, PBXs,

ISDN, or the PSTN.

The key to integrating voice and data networks using a Cisco VG200 gateway is

Cisco CallManager, which handles call requests and establishes connections

between IP devices placing and receiving calls.

When you use a Cisco VG200 gateway with H.323, Cisco CallManager can be

used like an H.323 proxy. You can identify the Cisco CallManager server as the

only H.323 endpoint known to the Cisco VG200 gateway on its Ethernet (LAN)

port, so you do not have to configure and maintain a complex dialing plan on the

gateway. This also allows the use of less intelligent IP telephony devices within

an H.323 voice network, because not every device has to function as an H.323

endpoint.

You configure the Cisco VG200 gateway with information about

Cisco CallManager, using the Cisco IOS command line interface (CLI). The

procedures and commands required to perform this configuration are described in

Chapter 3, "Configuring Voice over IP."

When used with MGCP, you must also configure the Cisco CallManager server

with information about each port on a Cisco VG200 gateway, using the

Cisco CallManager Administrator, a Web-based graphic user interface (GUI).

The Cisco CallManager Administration Guide describes the procedures for

performing this configuration.

Using the Cisco VG200 with MGCP

To use a Cisco VG200 gateway with MGCP, you must use Cisco CallManager as

the call agent, and you currently must use an analog voice network module and

FXS or FXO voice interface cards. You use the Cisco IOS CLI to enable MGCP

on the gateway and to identify the Cisco CallManager server. Cisco CallManager

then assumes control over establishing and tearing down connections between IP

endpoints on your network and endpoints connected through the PSTN.

When using MGCP with a Cisco VG200 gateway, all dial-plan related

configuration elements are controlled by Cisco CallManager, and should not be

configured in the Cisco VG200 gateway for MGCP-managed endpoints.

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For connecting to a PBX by means of a trunk (tie) line using Ear and

Mouth (E&M) emulation

Using the Cisco VG200 with MGCP

Software Configuration Guide for the Cisco VG200

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