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Avaya Modular Messaging Concepts and Planning Guide
5-28 November 2004
Avaya Modular Messaging Concepts and
Planning Guide
message store and the Offline Call Answer Store server are
unavailable.
! Call Me and MWI are installed on a single MAS. If that MAS
goes down, neither of these services will work.
! Find Me will not work for H.323 and QSIG integrations, if:
— the ports on the MAS that received the call do not support
outcalling applications
— the ports on the remaining in-service MAS units do not
support outcalling applications
Note: In such circumstances, Modular Messaging prompts
the caller to leave a Call Answer message.
! Outbound fax (Modular Messaging—Avaya MSS only)
Note: It is possible to install the Fax Sender Server on more
than one MAS in a voice mail domain. In such a
case, it becomes easier to reconfigure the system to
use a different MAS for fax sending before a planned
outage.
Distributing ports in an N+1 server configuration
In an N+1 server configuration, ports can be distributed in any of the
following methods:
! Additional capacity (recommended)
In this method, more ports than are required for day-to-day use
are deployed. Additional ports may be added to the N+1 MAS
until the system limits on ports and MAS units is reached. The
additional ports are used for normal operation and ensure that
even when an MAS is down, customers still have the number of
ports they need to provide desired service levels.
! Spread
In this method, the port capacity of the voice mail domain
remains unchanged even after implementing an additional MAS
(N+1). The required number of ports are spread across all MAS
units, including the N+1 MAS. If a server goes down, the system
will have less capacity than normal, but is still able to provide
service.