450
Item Description
VAD
Configure VAD. The VAD discriminates between silence and speech on a voice
connection according to their energies. VAD reduces the bandwidth requirements of
a voice connection by not generating traffic during periods of silence in an active
voice connection. Speech signals are generated and transmitted only when an
active voice segment is detected. Researches show that VAD can save the
transmission bandwidth by 50%.
• Enable.
• Disable.
By default, VAD is disabled.
Select the
Number(s)
Select the boxes of desired local numbers, and then click the
Apply to Selected
Number(s)
button to apply the above advanced settings to the selected local
numbers.
Call route
Fax and Modem
Select Voice Management > Advanced Configuration > Batch Configuration from the
navigation tree, and then click the Fax and Modem link in the Call Route area to access the call
route fax and modem configuration page, as shown in Figure 852.
Figure 852
Call route
fax and Modem configuration page
Table 302 Configuration items
Item Description
Fax Protocol
Specify the protocol used for fax communication with other devices.
• T.38 —Use T.38 fax protocol. With this protocol, a fax connection can be set up
quickly.
• Standard T.38— Use the standard T38 protocol of H323 or SIP. The fax
negotiation mode depends on the protocol used (H323 or SIP).
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