Avaya BCM 4.0 Networking Guía de configuración descargar pdf (Pagina 148)

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148 Chapter 8 Configuring telephony resources

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Settings

Enable Voice

Activity Detection

<check box> The voice activity detection (silence suppression) identifies

periods of silence in a conversation, and stops sending IP

speech packets during those periods. In a typical telephone

conversation, most of the conversation is half-duplex, meaning

that one person is speaking while the other is listening. For more

information refer to “Silence suppression” on page 703.

If voice activity detection is enabled, no voice packets are sent

from the listener end. This greatly reduces bandwidth

requirements.

G.723.1 and G.729 support silence suppression.

G.711 does not support silence suppression.

Performance note: voice activity detection on all networked

BCMs and IPT systems (VAD setting on IPT systems) must be

consistent to ensure that interacting features such as Transfer

and Conference work correctly. As well, the Payload size on the

IPT must be set to 30ms.

Default: Disabled

Jitter Buffer Auto

None

Small

Medium

Large

Select the size of jitter buffer you want to allow for your system.

G.729 Payload Size

(ms)

10, 20, 30, 40, 50, 60

Default: 30

Set the maximum required payload size, per codec, for the VoIP

calls sent over H.323 trunks.

Note: Payload size can also be set for Nortel IP telephones.

Refer to the BCM 4.0 Telephony Device Configuration Guide

(N0027269).

G.723 Payload Size

(ms)

G.711 Payload Size

(ms)

10, 20, 30, 40, 50, 60

Default: 30

Incremental Payload

Size

<check box> When enabled, the system advertises a variable payload size

(40, 30, 20, 10 ms)

Enable T.38 <check box> Enabled: The system supports T.38 fax over IP.

Disabled: The system does not support T.38 fax over IP

Caution: Operations note: Fax tones that broadcast through a

telephone speaker will disrupt calls at other telephones using

VoIP trunks in the vicinity of the fax machine. Here are some

suggestions to minimize the possibility of your VoIP calls being

dropped because of fax tone interference:

Locate fax machine away from other telephones.

Turn the speaker volume on the fax machine to the lowest level,

or off, if that option is available.

Force G.711 for 3.1k

Audio

<check box> When enabled, the system forces the VoIP trunk to use the

G.711 codec for 3.1k audio signals such as modem or TTY

machines.

Note: This setting can also be used for fax machines if T.38 fax is

not enabled on the trunk.

Table 37 SIP Media parameters tab (Sheet 2 of 2)

Field Value Description

1 2 ... 143 144 145 146 147 148 149 150 151 152 153 ... 757 758

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