Avaya Modular Messaging Messaging Application Server

The Messaging Application Server (MAS) provides an interface between the message store (and directory) and the telephone system. In older documentation, the MAS is sometimes referred to as the "voice server".

A Modular Messaging system consists of at least one MAS and an Avaya-produced Message Store Server (Avaya MSS). Modular Messaging supports a maximum of five MAS units in a voice mail domain; plus, a standalone supplementary server.

Avaya Modular Messaging Release 5.2 introduces a feature, MultiSite, through which you can use a single Modular Messaging system to serve subscribers at multiple locations. With MultiSite, MASs in a single Voice Mail Domain (VMD) communicate with multiple PBXs possibly with different dial plans, in different locations. MultiSite enables you to use a single Modular Messaging system consisting of many MASs to service a global organization. With MultiSite you can group distributed Modular Messaging sites under a single Voice Mail Domain (VMD).

In a MultiSite-enabled environment, the MASs are co-located with the Avaya MSS server in a data center, but the subscribers can be anywhere. The MASs communicate through the WAN with distributed SIP gateways that are installed near the PBXs at the various sites to service the subscribers. All MASs in the voice mail domain can handle requests from subscribers associated with any site and from any configured switch.

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