Avaya BCM50 Konfigurationsanleitung PDF herunterladen (Seite 124)

124 Chapter 9 Configuring telephony resources

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Settings

Enable Voice

Activity Detection

<check box> The voice activity detection, also known as 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 529.

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 voice activity detection.

G.711 does not support voice activity detection.

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.

Default: Auto

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. See

the BCM 4.0 Telephony Device Installation 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 fax <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 may 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 23 H323 Media parameters record (Sheet 2 of 2)

Field Value Description

1 2 ... 119 120 121 122 123 124 125 126 127 128 129 ... 567 568

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