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Avaya Modular Messaging Concepts and Planning Guide
5-24 November 2004
Avaya Modular Messaging Concepts and
Planning Guide
Subscribers will not be able to log in to their mailboxes if the MAS is not
able to reach the Offline Call Answer Store.
Note: Offline Call Answer and Aria TUI Access to Offline Call
Answer Messages are capabilities intended to provide partial
service in rare instances of failures, and not to compensate for
an unreliable infrastructure.
When a Microsoft Exchange message store goes offline
A peer messaging server is the back-end server that the MAS units
communicate with when sending messages.
When a Microsoft Exchange e-mail server is offline, Call Answer and
subscriber access to Call Answer messages take place as described in
Offline Call Answer
on page 5-22 and Offline access to Call Answer
messages on page 5-23.
In Modular Messaging—Microsoft Exchange system, when an MAS
detects that the current peer Exchange server (primary peer) is not
accessible, the MAS attempts to establish communication with another
Exchange serve to act as the peer. This feature is known as Peer Failover
and can be enabled using the Voice Mail System Configuration
application. The initial peer Exchange server is known as the primary
peer Exchange server, to differentiate it from the failover peer.
When Avaya Modular Messaging—Microsoft Exchange version is
initially installed, an MAS is configured to have a single Microsoft
Exchange server handle message storage and processing for subscribers.
This Exchange server is known as the primary peer server. Each MAS in
the system configuration has an assigned primary peer server, though all
MAS units may share the same primary peer server.
System administrators can identify and configure additional peer servers
within the voice mail domain that can handle messaging on behalf of
subscribers if the primary peer server fails. Thus, if the primary peer
server for an MAS fails, the MAS can search for another peer server to
allow messaging to continue. Each MAS in the system is assigned its own
list of non-primary peer servers for backup. Servers that are candidates to
become the peer server in the event that the primary peer server becomes
unavailable are known as failover peer servers.
For information on configuring the system to continue messaging when
the Microsoft Exchange server goes offline, see Avaya Modular
Messaging Release 2 Messaging Application Server Administration
Guide for Avaya Modular Messaging with the Avaya MAS and MSS,
11-300243.