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Port Sizing
November 2004
Avaya Modular Messaging Concepts and 
Planning Guide
12-3
Modular 
Messaging—MSS
Modular Messaging—MSS subscribers typically use the system for voice 
and fax messaging. A separate, customer-provided system is used for 
e-mail messages. 
Subscribers use the system primarily for retrieval of voice and fax 
messages by means of a telephone, hence port usage is high. Subscribers 
that wish to have corporate e-mails read to them over the telephone would 
use the UCC Speech Access client. When subscribers access their voice 
and e-mail messages via UCC Speech Access, they are not using Modular 
Messaging ports, hence port usage decreases on the Modular Messaging 
system.
The Modular Messaging—MSS system is intended for traditional port 
usage, with six minutes of voice messaging per day per subscriber. 
Port usage consists primarily of Call Answer sessions and message 
retrieval using the TUIs. There is also a small amount of port usage for 
such features as Call Me, Find Me, Message Waiting Indicator (MWI) 
Automated Attendants, Caller Applications, and the Fax Sender Server.  
Modular 
Messaging—
Exchange and 
Modular 
Messaging—
Domino
Subscribers of Modular Messaging—Microsoft Exchange and Modular 
Messaging—IBM Lotus Domino use the system for voice, fax
1
, and 
e-mail messaging. 
Typically, subscribers use graphical user interface (GUI) clients for 
messaging, hence, port usage is lower, with 4.5 minutes of messaging per 
day per subscriber (including text-to-speech conversion of e-mail 
messages). 
Port usage consists primarily of Call Answer sessions. A significant 
portion of retrieval time using the voice ports is for text-to-speech of 
e-mail messages. 
Modular Messaging—MSS offers
Take into consideration the following items before referring to the offers:
!
The Modular Messaging—MSS system is intended for traditional 
port usage, with six minutes of voice messaging per day per 
subscriber.
!
These tables indicate the maximum number of subscribers 
supported by the given port configuration. When provisioning a 
new system, it is recommended to allow for growth. If the initial 
number of subscribers is within 5 to 15% of the maximum, the 
next size system is recommended.
!
These tables provide for traffic patterns of 14% busy hour traffic.
1. Fax capabilities are provided by means of a customer-provided third-party fax server.