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Customer environment
November 2004
Avaya Modular Messaging Concepts and 
Planning Guide
B-7
Considerations when implementing Modular 
Messaging—MSS 
Modular Messaging—Avaya Message Storage Server (MSS) uses a 
dedicated server and private network to isolate critical components from 
reliance on the customer's IT and e-mail infrastructure. Basic voicemail 
features including Call Answer and telephone retrieval of messages 
operate completely independently of this infrastructure. However, certain 
features rely on and interoperate with aspects of the customer's 
infrastructure. 
IT and e-mail infrastructure considerations when implementing Modular 
Messaging—MSS are: 
!
The MSS and messaging application server (MAS) hosts need to 
be added to the customer's DNS servers for any desktop client 
usage (including Client Add-in for Microsoft Outlook and 
Subscriber Options), as well as for sending networked messages 
and directory updates between multiple (separate) Modular 
Messaging systems or between Modular Messaging and Message 
Networking systems in the customer network. Networking 
between Modular Messaging or Modular Messaging and 
Message Networking systems can also be done by adding these 
systems to each other's /etc/hosts files without relying on DNS. 
!
The Modular Messaging—MSS system delivers all messages 
sent outside of its Voice Mail Domain, that is, networked 
messages and Notify Me messages, with the standard 
SMTP/MIME e-mail protocols using the customer's IT and 
e-mail infrastructure. Depending on the MSS configuration 
options, these messages are sent either using DNS MX (mail 
exchanger) lookups of the recipient's host.domain or using an 
administered e-mail gateway which then relays the message to its 
recipient. Although a configuration where networked messages 
are sent directly to the destination Modular Messaging (or 
Message Networking) machine and all Notify Me messages are 
sent to a gateway is not explicitly supported, this behavior can be 
achieved using DNS MX routing. To do this, the customer must 
provide a DNS server that responds to MX queries for all hosts 
with the host name of the gateway and either administer 
networked machines via /etc/hosts or have the DNS server return 
the actual IP address for networked Modular Messaging hosts. 
!
Messages sent outside a voice mail domain using SMTP/MIME 
carry an e-mail "from:" address identifying the sender's Modular 
Messaging mailbox, typically in the form 
first.last@mmsystem.domain.company.com. If these messages 
are sent through an e-mail gateway in the customer's network that 
modifies outbound "from:" addresses, for example replacing the