Nortel Networks 1000S - Manual (Page 41)

Configuration options Page 41 of 44
Communication Server 1000S Overview
• full-featured networking between sites using IP Peer Networking and/or
TIE trunks
• transparent to user at all sites
Reliability strategies
Communication reliability is critical to the operation of any business. A
number of capabilities are available in CS 1000S to ensure that telephony is
available when one or more of the following situations occur:
• a hardware component fails
• a software component fails
• the IP network suffers an outage
The CS 1000S provides several levels of redundancy to ensure that the
telephony services can withstand single hardware and network failures.
CS 1000S provides the following component redundancy:
• Call Server with automatic database distribution
• Signaling Server software, including H.323 Gateway and IP Phone
software
• H.323 Gatekeeper
• H.323 Gateway interface to Gatekeeper
• Campus-distributed MG 1000S in Survival Mode
You can provision a CS 1000S to provide the following component
redundancy:
• If the Call Server is unavailable, you can configure MG 1000S systems
as survivable independent systems (automatic database
synchronization).
Note: If the MG 1000S is not configured as survivable, then it is out of
service until the Call Server is in service again.
• If the Call Server is unavailable, the IP telephony node can re-register
with one MG 1000S specified as an Alternate Call Server.