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Modular Messaging features
November 2004
Avaya Modular Messaging Concepts and
Planning Guide
5-19
G.711 encoding produces higher quality sound. If customers that use
GSM encoding find that sound quality is inferior, they may consider
changing to G.711 encoding for improved sound quality.
Notes:
1. If customers have upgraded from a version of Avaya Unified
Messenger Solution that used Rhetorex ADPCM, they can
continue to use the Rhetorex ADPCM format. However,
customers cannot create new voice mail domains that use
Rhetorex ADPCM. ADPCM is not available with Dialogic
telephony.
2. An MAS can play and record the GSM, G.711 A-law, and G.711
µ-law audio encoding formats. The single format specified by the
voice mail domain setting refers to the format used to record
voice messages, recorded names, and greetings by the TUI and
GUI clients. The G.711 format is used to record system and Caller
Application prompts.
3. A message store may contain some messages encoded with GSM
and some with G.711. This could happen if the encoding is
changed, or if networked-messages use a different encoder than
used in the MAS of its voice mail domain. For example, an MSS
may receive G.711-encoded messages from the MAS and
GSM-encoded messages from remote subscribers.
Binary size and MIME transfer size
Modular Messaging—MSS stores voice messages in their native binary
GSM or G.711 format, but uses the base64 encoding scheme to encode
audio data when transferring binary messages using Multipurpose
Internet Message Extensions (MIME). A binary message that is
base64-encoded, occupies about 37% more space than the original binary
message. For example, a message that originally occupies 300 KB will
occupy about 411 KB after base64 encoding.
When Modular Messaging—MSS subscribers use a standards-based
e-mail client to listen a message, the size of the message displayed by the
e-mail client is the MIME transfer size of the message, after base64
encoding. This size includes a 37% increase in size as compared to the
original size of the message, irrespective of the encoding format used
(GSM or G.711).
How message size
impacts message
transfer by GUI
clients
When subscribers use a graphical user interface (GUI) client to retrieve a
voice message, the entire message may be downloaded to the client.