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Implementing Cisco Unified Communications Manager, Part 1 (CIPT1) Foundation Learning Guide: (CCNP Voice CIPT1 642-447), Second Edition by Joshua Samuel Finke

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Chapter 8. Implementing PSTN Gateways in Cisco Unified Communications Manager

To place external calls, Cisco Unified Communications Manager (CUCM) deployments need a connection to the public switched telephone network (PSTN). PSTN connections are provided through gateways, which connect traditional time-division multiplexing (TDM) telephony interfaces (digital T1/E1 or analog FXO ports) and VoIP domains. Gateways can be integrated in Cisco Unified Communications Manager by using different protocols such as Media Gateway Control Protocol (MGCP), H.323, or Session Initiation Protocol (SIP) for signaling on VoIP call legs.

This chapter describes the role and implementation of MGCP, H.323, and SIP gateways to provide PSTN access to a Cisco Unified ...

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