Chapter 2. Centralized Call Processing Redundancy

This chapter reviews the mechanisms for providing call survivability and device failover in remote sites. This includes the configuration of Cisco IOS routers as Survivable Remote Site Telephony (SRST) gateways with MGCP fallback, and the use of Cisco Unified Communications Manager Express in SRST mode.

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This section reviews the mechanisms for providing call survivability and device failover in remote sites. SRST and MGCP gateway fallback are the key components to deliver fail-safe communication services.

To use SRST as your fallback mode on an MGCP gateway, SRST and MGCP fallback must be configured on the same gateway. SIP SRST provides a basic set of features to SIP-based IP Phones. ...

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