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Voice Compression vs. Bandwidth
The PBXgateway II provides a choice of voice compression algorithms to allow up to 24 phones to be
extended over T1, Fractional T1, or ISDN lines. The compression algorithm selected determines the
bandwidth required.
Note: Bandwidth is only a concern if the client is using EXTender 6000 units connected via RVP_Direct.
T1:
A digital transmission link at speeds of 1.544 million bits per second (or Twenty–four DS0s).
DS0: The worldwide standard speed for digitized voice conversation at 64,000 bits per second.
ISDN: A digital transmission link consisting of two "B" channels (bearer) for voice and one "D" channel
(data). Each "B" channel transmits voice signals at 64,000 bits per second.
The following are user selectable voice compression methods supported by the PBXgateway II to
accommodate the available bandwidth: G.729A (8 Kbps), ADPCM 24 (24 Kbps), ADPCM 32 (32 Kbps),
and G.711 (64 Kbps).
Note: These numbers indicate the bandwidth required per phone, not including overhead.
PBXgateway II System Administrator's Guide
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