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Issue 6 January 2008 265
Reliability and Recovery
The purpose of this chapter is to provide the reader an overview of the subject of
communication-system “availability,” specific to Avaya Communication Manager and Avaya
servers and gateways. The discussion that follows demonstrates Avaya’s long-standing
commitment to high availability in hardware and software design and the architectural strength
of Avaya Application Solutions.
A brief description of availability and its significance to a communications system is provided.
Hardware-design considerations, software-design and recovery considerations, IP Telephone
and remote media gateway recovery, and overall maintenance strategy are also described. The
reliability tables specify the reliability performance of Avaya Application Solutions building
blocks.
This chapter contains information on these topics:
R
eliability
Survivability solutions
● S8700-series Server Separation
● Enterprise survivable servers (ESS)
● Connection preserving upgrades for duplex servers
● Inter Gateway Alternate Routing (IGAR)
Survivability for branch office media gateways
● H.248 Media Gateway recovery via LSP
● Modem dial-up backup
● Auto fallback to primary Communication Manager for H.248 media gateways
● Connection preserving failover/failback for H.248 media gateways
● G250 and IG550 Media Gateway standard local survivability function (SLS)
IP endpoint recovery
● IP endpoint recovery
● Recovery algorithm
● IP Endpoint Time to Service