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CCNP Voice CIPT1 642-447: Quick Reference, Second Edition by David Bateman

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Chapter 4. Single-Site Off-Net Calling

This chapter reviews the configuration PSTN gateways and dial plans for the support of off-net calling.

Gateway Overview

A gateway is a device that can translates between different signaling and media, which is often divided into two types:

Analog: Connects an analog device or line to a CUCM environment

Digital: Connects a digital trunk, such as a T1, to a CUCM environment

Gateways must provide the following:

• DTMF relay

• Supplementary services

• CM redundancy

• Call survivability

Following are four protocols that gateways use to communicate with CUCM.

H.323: Peer-to-peer protocol; requires its own dial plan

MGCP: Client/server protocol; relies on CUCM for dial plan; supports PRI Backhaul

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