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CCIE Voice v3.0 Quick Reference by Mark Lewis

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Chapter 5. IOS IP Telephony Skills

The Cisco IP telephony product range includes IOS-based devices and mechanisms, including Survivable Remote Site Telephony (SRST), Cisco Unified Communications Manager Express (CME), and Cisco Unity Express (CUE).

Survivable Remote Site Telephony

Survivable Remote Site Telephony (SRST) is a feature that ensures that IP phones can continue to function even if they are unable to communicate with CUCM. During a failure, Cisco IP phones register with the local SRST router, which provides call processing and control. If Cisco IP phones detect that CUCM has come back online, they can fail back to that CUCM after a configurable interval (connection monitor duration). Cisco IP phones do not fail back immediately to ...

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