References; Geographic Redundancy - Nortel 5100 Release Note

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UNIStim telephones are supported by the IP Client Manager (IPCM). SIP
telephones communicate directly with the Session Manager.

References

For more information, see the following documents:
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Geographic redundancy

MCS 5100 Release 3.x implemented Layer 2 redundancy. This redundancy
involved two systems, located within a short distance of each other,
configured in the same subnet.
MCS 5100 Release 4.0 introduces Geographic redundancy. Geographic
redundancy (also known as Layer 3 redundancy), involves two MCS
systems that are separated by some distance, and that are configured in
Copyright © 2007, Nortel Networks
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Nortel IP Phone 2002, Nortel IP Phone 2004 and Nortel IP Phone 2007
Nortel IP Phone 2004 with SIP Firmware (Phase 2 telephones only)
Nortel Multimedia PC Client
Nortel Multimedia Office Client
Nortel Multimedia PC Client for IBM Lotus Notes
RIM BlackBerry device (6000 and 7000 series) with the MCS Multimedia
Wireless Client software
standards-compliant third-party SIP clients (for example, the Manitone
ipDialog SIP telephone)
Dual Mode Mobile (DMM) wireless telephones
Accounting Manager Fundamentals (NN42020-144)
Database Manager Fundamentals (NN42020-142)
IP Client Manager Fundamentals (NN42020-106)
MCS 5100 Overview (NN42020-143)
MCS Installation and Commissioning (NN42020-308)
MCS Upgrades—Maintenance Releases (NN42020-303)
MCS Upgrades—Release 3.x to Release 4.0 (NN42020-405)
MCS 5100 Planning and Engineering (NN42020-200)
Provisioning Manager Fundamentals (NN42020-111)
Session Manager Fundamentals (NN42020-107)
System Manager Fundamentals (NN42020-109)
Wireless Client Manager Fundamentals (NN42020-118)
Nortel Multimedia Communication Server 5100
New in this Release
NN42020-404 03.08 Standard
Release 4.0 11 September 2007
Geographic redundancy 37