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Modular Messaging features
November 2004
Avaya Modular Messaging Concepts and
Planning Guide
5-27
N+1 server configuration
Modular Messaging offers redundancy of voice ports by way of an N+1
server configuration.
N+1 server configuration is the implementation of more than the
minimum number of messaging application servers recommended, to
increase availability and reliability. An N+1 server configuration can be
implemented only if certain established maximum limits are not
exceeded. These limits are:
! A 144-port limit and a five MAS limit for Modular Messaging—
Avaya MSS version.
! A 10 MAS limit for Modular Messaging—Microsoft Exchange
version and Modular Messaging—IBM Lotus Domino version
If the Tracing Server and the Offline Access Store are installed on
machines other than an MAS, those machines do not count toward the
MAS limit.
Important:N+1 server configuration is currently available only with
Avaya Communication Manager or DEFINITY G3 switches.
Added redundancy with N+1 server configuration
An N+1 server configuration provides redundancy for:
! Inbound services
Call Answer, subscriber access, dual-connect for GUI access,
Automated Attendant, caller applications, fax answer and transfer
(Microsoft Exchange and IBM Lotus Domino message stores),
and inbound fax receipt (MSS only)
! Outbound services
Find Me (DSE integrations) and Automated Attendant transfers
Some Modular Messaging services are MAS-dependent and could be
affected if they are on the MAS that goes out of service. These services
include:
! The Tracing Server (if the Tracing Server resides on an MAS)
! The Offline Call Answer Store server. An MAS will not offer
offline access if it is unable to communicate with the Offline Call
Answer Store server. This condition does not arise unless both the