To place external calls, Cisco Unified Communications Manager (Cisco Unified Communications Manager) deployments need a connection to the public switched telephone network (PSTN). Such connections are provided by gateways, which connect traditional telephony interfaces (such as digital or analog trunks) 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 course describes the role and implementation of MGCP, H.323, and SIP gateways to provide PSTN access to a Cisco Unified Communications Manager environment.

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