Message Compression and storage on the Hard Drive

[dseller]

Anybody know what the formula is for how many seconds, or minutes, or hours of storage per Giga Byte on the Exchange hard drive?

[Christopher McAlpin]

I do not know the formula, but here are some examples of voice messages per codec.

Voice Message File Sizes and Audio Quality Ratings

Audio Codec G.711 Mu-Law and A-Law

Approximate File Size, 1-Minute Message 480 KB

Quality Rating Excellent

Audio Codec OKI ADPCM 8 kHz

Approximate File Size, 1-Minute Message 240 KB

Quality Rating Fine

Audio Codec OKI ADPCM 6 kHz

Approximate File Size, 1-Minute Message 180 KB

Quality Rating Fine

Audio Codec GSM 6.10

Approximate File Size, 1-Minute Message 98 KB

Quality Rating Good

Audio Codec G.729a

Approximate File Size, 1-Minute Message 60 KB

Quality Rating Good