Avaya BCM 2.0 IP Telephony Manual de usuario descargar pdf (Pagina 39)

Engineering guidelines 39

P0911590 Issue 02 Enterprise Edge 2.0 IP Telephony Configuration Guide

Figure 5 Silence compression

To provide a more natural sound, comfort noise is added at the destination gateway

during the silent periods to calls where silence compression is active. Silence

compression can cause a sensed degradation in audio quality. Silence compression

can be disabled. With silence compression disabled, the bandwidth use of the LAN/

WAN approximately multiplies by two.

If an IP gateway acts as a tandem switch in a network where circuit-switched trunk

facilities have a large amount of low audio level, enabling silence compression

degrades the quality of service, causing broken speech. Under tandem switching

conditions, with a large amount of low audio level, disable the silence compression

using the IP telephony interface.

Fax calls use a G.711 codec which does not support silence compression. Fax calls

require 64 kbit/s bandwidth. For more information about fax calls, see the Fax calls

section on page 41.

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Avaya BCM 2.0 IP Telephony Manual de usuario Pagina 39