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Cisco VG200 Using Manual
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Cisco VG200 Using Manual

Cisco VG200 Using Manual

Voice gateway
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Using the Cisco Voice Gateway 200
This chapter describes how to use the Cisco Voice Gateway 200 (VG200) with
Cisco CallManager 3.0 or later. It introduces the Media Gateway Control
Protocol (MGCP) and describes how MGCP supports redundant
Cisco CallManager servers. This chapter then provides an overview of the
configuration required to make this work. This chapter includes the following
topics:
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Voice over IP Overview
Voice over IP (VoIP) enables your gateway to carry live voice traffic (for example,
telephone calls and faxes) over an IP network. VoIP can consolidate voice and
data traffic for more efficient use of bandwidth, reduce toll charges, and enable
alternatives to expensive and proprietary PBX systems.
The Cisco VG200 is an important component of a VoIP solution, providing a
simple and inexpensive interface between an Ethernet data network and the Public
Switched Telephone Network (PSTN).
78-10322-02
Voice over IP Overview, page 1-1
Using the Cisco VG200 with Cisco CallManager, page 1-6
Using the Cisco VG200 with MGCP, page 1-7
Using a Cisco VG200 Gateway with H.323, page 1-8
Where to Go Next, page 1-14
C H A P T E R
Software Configuration Guide for the Cisco VG200
1
1-1

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Summary of Contents for Cisco VG200

  • Page 1 C H A P T E R Using the Cisco Voice Gateway 200 This chapter describes how to use the Cisco Voice Gateway 200 (VG200) with Cisco CallManager 3.0 or later. It introduces the Media Gateway Control Protocol (MGCP) and describes how MGCP supports redundant Cisco CallManager servers.
  • Page 2 Using the Cisco Voice Gateway 200 Voice over IP Overview This section covers the following topics, describing in a general way how VoIP works and defining the standards supported by the Cisco VG200 used to implement a VoIP network. Implementing a VoIP Network, page 1-2 •...
  • Page 3 However, to connect to the PSTN, an intermediary device, called a gateway, is required. A VoIP gateway, such as the Cisco VG200, allows users of IP phones and PC-based soft phones to exchange calls with users of plain old telephone service (POTS) phones on the PSTN.
  • Page 4 H.225—Used for call signaling and call setup • Registration, Admission and Status (RAS)—Used to communicate with the • H.323 gatekeeper Real-Time Protocol/Real-Time Control Protocol (RTP/RTCP)—Used to • create and transmit audio packets on the IP data network Software Configuration Guide for the Cisco VG200 78-10322-02...
  • Page 5 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 78-10322-02...
  • Page 6 Using the Cisco VG200 with Cisco CallManager Using the Cisco VG200 with Cisco CallManager When used with Cisco CallManager 3.0 or later as a call agent, the Cisco VG200 functions as an MGCP gateway. The Cisco VG200 supports MGCP only on its Foreign Exchange Station (FXS) and Foreign Exchange Office (FXO) analog ports, while it supports H.323 on its T1 digital ports.
  • Page 7 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.
  • Page 8 Using the Cisco Voice Gateway 200 Using a Cisco VG200 Gateway with H.323 When you use a Cisco VG200 gateway with Cisco CallManager, you can use its redundant call agent feature to eliminate a potential single point of failure in the VoIP network.
  • Page 9 This eliminates the chance that a single DS-0 could fail, or that a DS-0 is busy at the time of a call. To use a Cisco VG200 gateway to interconnect a VoIP network and a T1 connection, you configure from 1 to 24 DS-0 groups for each T1 connection, and then define a voice port for each DS-0 group.
  • Page 10 DID service is provided only on incoming connections, so to use it, you must divide your T1 channels into incoming and outgoing DS-0 groups. You can configure your dial plan on a Cisco VG200 gateway, using Cisco IOS CLI commands to identify the destination endpoint and coder-decoder (CODEC) for each incoming call on each DS-0 group.
  • Page 11 E&M Emulation As shown in Figure 1-7, you can use the T1-CAS port on a Cisco VG200 gateway with E&M analog emulation. E&M signalling emulation lets you use a Cisco VG200 gateway to interconnect H.323 devices on a VoIP network with POTS devices over a standard trunk (tie) line.
  • Page 12 Chapter 1 Using the Cisco Voice Gateway 200 Using a Cisco VG200 Gateway with H.323 Figure 1-7 Using E&M Analog Emulation with T1-CAS 1 or 2 T1-CAS T1 ports Port 0 DS-0 groups 0-23 Voice Gateway DS-0 groups 0-23 Port 1 E&M emulation...
  • Page 13 This example assumes that the company already has established a working IP connection between its two remote offices. PBXs should be configured to pass all DTMF signals to the gateway. Cisco recommends that you do not configure “store-and-forward” tone. Note If you change the gain or the telephony port, make sure that the telephony port still accepts DTMF signals.

  • Page 14: Where To Go Next

    Cisco VG200 gateway, you should proceed to Chapter 2, “Basic Configuration.” Chapter 2 describes the procedures required to configure your Cisco VG200 gateway, however you choose to use it. Even if you are familiar with other Cisco products, you should refer to Chapter 2 because the configuration of a Cisco VG200 gateway is a little different from Cisco routers.