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Cisco CallManager Fundamentals, Second Edition by Delon Whetten, Anne Smith, Chris Pearce, John Alexander

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Chapter 4. Trunk Devices

This chapter discusses the gateway protocols that Cisco CallManager uses to communicate with Cisco gateway and trunk devices.

The primary purpose of station devices is to provide telephony services to individuals, and the primary purpose of gateway devices is to connect telephony networks to each other. CallManager uses gateway devices to allow IP telephony users to connect to non-IP-enabled telephony networks such as the Public Switched Telephone Network (PSTN) or on legacy circuit-switched Private Branch Exchanges (PBX).

CallManager also uses IP-to-IP trunking to connect members in one CallManager cluster to other voice over IP (VoIP) networks. In addition, IP trunking is used to connect one CallManager cluster to another ...

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