TA1600/2400/3200 User Manual
41/87
Enable Do Not Disturb
*77
Activate "Do Not Disturb". Once activated,
the FXS port will reject all incoming calls.
Disable Do Not Disturb
*077
Disable "Do Not Disturb" for the FXS port
by pressing the feature code on the phone.
It will recover normal ringing upon the
arrival of incoming calls.