2616 CHAPTER 173: VO IP C ONFIGURATION COMMANDSundo typeView Analog E&M voice subscriber line viewParameter 1, 2, 3 and 5: Correspond respectively to the four signal types of analog E&Msubscriber 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. system-view[Sysname] voice-setup[Sysname-voice] subscriber-line 1/0[Sysname-voice-line1/0] type 3vad-onSyntax vad-onundo vad-onView POTS/VoIP/VoFR entity viewParameter NoneDescription Use the vad-on command to enable voice activity detection (VAD) function.Use the undo vad-on command 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 avoice connection according to their energies. VAD reduces the bandwidthrequirements of a voice connection by not generating traffic during periods ofsilence in an active voice connection. Speech signals are generated andtransmitted only when an active voice segment is detected. Researches show thatVAD can save the transmission bandwidth by 50%.Related command: cng-on.Example # Enable VAD on POTS voice entity 10.
