2593Use the undo echo-canceller command to restore the default.By default, the convergence rate of comfort noise amplitude is 0, the maximumamplitude of comfort noise is 256, the comfort noise mixture proportion controlfactor is 100, and the threshold of two-way talk is 1.Related command: echo-canceller.Example # Set the convergence rate of comfort noise amplitude to 50. system-view[Sysname] voice-setup[Sysname-voice] echo-canceller parameter convergence-rate 50em-phy-parmSyntax em-phy-parm { 2-wire | 4-wire }undo em-phy-parmView Analog E&M voice subscriber line viewParameter 2-wire: Chooses the 2-wire analog E&M wire scheme.4-wire: Chooses the 4-wire analog E&M wire scheme.Description Use the em-phy-parm command to configure a wire scheme for the analog E&Msubscriber line.Use the undo em-phy-parm command to restore the default.By default, the 4-wire analog E&M cable is selected.This command is only applicable only to the analog E&M subscriber line. Theconfiguration will apply to all E&M interfaces of the card after you configure thiscommand.Example # Choose the 4-wire scheme for the analog E&M subscriber line. system-view[Sysname] voice-setup[Sysname-voice] subscriber-line 1/0[Sysname-voice-line1/0] em-phy-parm 4-wireem-signalSyntax em-signal { delay | immediate | wink }undo em-signal
