3Com MSR 30, MSR 50 manual Vad-on, Undo type, Syntax vad-on, Undo vad-on, Related command cng-on

2616 CHAPTER 173: VOIP CONFIGURATION COMMANDS

	undo type
View	Analog E&M voice subscriber line view
Parameter	1, 2, 3 and 5: Correspond respectively to the four signal types of analog E&M
	subscriber lines, i.e. type 1, 2, 3 and 5.
Description	Use the type command to configure the analog E&M subscriber line signal type.
	Use the undo type command to cancel the existing settings.
	By default, the analog E&M subscriber line signal type is type 5.
	This command is only applicable to the analog E&M subscriber line.
Example	# Configure subscriber line 1/0 analog E&M subscriber line type as type 3.
	<Sysname> system-view
	[Sysname] voice-setup
	[Sysname-voice] subscriber-line 1/0
	[Sysname-voice-line1/0] type 3

vad-on

Syntax vad-on

undo vad-on

View POTS/VoIP/VoFR entity view

Parameter None

Description Use the vad-oncommand to enable voice activity detection (VAD) function.

Use the undo vad-oncommand to disable silence detection function.

By default, the silence detection function is disabled.

Note that G.711 codec does not support VAD.

The voice activity detection (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%.

Related command: cng-on.

Example # Enable VAD on POTS voice entity 10.