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Microsoft® Lync Server 2010 Unleashed by Tom Pacyk, Andrew Abbate, Alex Lewis

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Audio Codecs and Voice Message Sizes

Codec is a contraction of coding and decoding digital data. This is the format in which the audio stream is stored. It includes both the number of bit rate (bits/sec) and compression that is used.

One of the following codecs is used by the Unified Messaging server to encode the messages:

Windows Media Audio (WMA)—16-bit compressed

GSM 06.10 (GSM)—8-bit compressed

G.711 PCM Linear (G711)—16-bit uncompressed

Mpeg Audio Layer 3 (MP3)—16-bit compressed

The Exchange 2010 unified messaging default is MP3. This is a change from Exchange 2007 where the default was WMA. Although using WMA results in slightly smaller file sizes, most people prefer the universal nature of MP3. This enables a much larger number ...

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