Avaya IP Office 8.1 Product Description page 287

Resilient Multi-Site Networking(SCN)(see the diagram below)
In an SCN configuration of System "A" and System "B" where the centralized voicemail is connected to
System B, and a number of IP telephones are connected to either System A or System B. If System "B"
fails then:
System A will automatically take over from System B and support Avaya IP telephones, hunt groups,
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and DHCP if required.
Voicemail Pro will reregister to System A.
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For users in an Small Community Network (SCN), when they hot desk to another IP Office system,
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they retain their licensed profile setting as configured on their home system.
All System B users' Personal contacts/Call Logs will continue to be available (1600 Telephones).
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For Multi-Site Networks (SCN), VCM modules are required in all systems being connected. The IP lines may be
configured in a start or a meshed configuration. One of the advantages of a meshed configuration is that it
removes the risk of a single point of failure within the network. Also the names and numbers (groups, line,
services, etc) on the separate IP Office systems should be unique to reduce potential maintenance confusion.
Each IP Office system broadcasts UDP messages on Port 50795. These broadcasts typically recur every 30
seconds but BLF updates are potentially more frequent. There are no updates if there is no activity and the
overall level of traffic is very low – typically less than 1 kbps per system.
Product Description
IP Office 8.1
© 2012 AVAYA All rights reserved.
Page 287
Issue 26.k.- (16 August 2012)