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November 2004
Avaya Modular Messaging Concepts and
Planning Guide
12-19
The conversion of text-to-speech (TTS) is achieved by licensed speech
synthesis software, known as e-mail readers. TTS conversion is also used
to convert the text names of mailboxes when subscribers have not
recorded their spoken names, and to read envelope information.
Modular Messaging includes two e-mail readers bundled with each
messaging application server (MAS). These two e-mail readers enable
two concurrent text to speech conversions per MAS. If subscribers are
likely to make extensive use of the TUIs to retrieve e-mail and fax
messages, customers may need to purchase additional e-mail readers.
Modular
Messaging—MSS
Subscribers of Modular Messaging—MSS can use the TUI to access
voice and fax messages. As subscribers cannot use the TUI to access
corporate e-mail messages, usage of e-mail readers is primarily for TTS
conversion of fax message subjects and spoken names of subscribers. For
such usage, the default number of e-mail readers should suffice. With
Modular Messaging—MSS, the e-mail reader capacity for a voice mail
domain is 2 x number of MAS units. Additional e-mail readers cannot be
purchased.
Modular Messaging
with e-mail servers
Subscribers of Modular Messaging—Microsoft Exchange and Modular
Messaging—IBM Lotus Domino can use the TUI to access voice, fax,
and corporate e-mail messages. The Modular Messaging offers indicate
the number of e-mail readers recommended.
The calculations in these tables assume that when using the TUI to
retrieve messages, subscribers are likely to spend 60% of the message
retrieval time for TTS conversion of e-mail messages. When a message is
played using TTS conversion, it is assumed that an e-mail reader is
required for 10% of the actual message play time.
With Modular Messaging—Exchange and Modular Messaging—
Domino, an MAS supports a maximum of 12 e-mail readers, enabling 12
concurrent text to speech conversions on an MAS.
To calculate the number of additional e-mail readers required, see the
E-mail readers recommended for e-mail (Included) column of the
Modular Messaging offers. Each MAS application license includes two
TTS resources.
The calculation for additional e-mail readers is:
(Number of e-mail readers recommended) - (Number of e-mail readers
included).
The number of e-mail readers purchased is for the entire voice mail
domain. Customers are responsible for allocating e-mail readers among
the MAS units in the voice mail domain. Customers are advised to
allocate e-mail readers in proportion to the number of ports on each MAS.