Extended features and functions, Call restriction, To activate call restriction – Audiovox MVX501 User Manual
Page 14: To exit call restriction mode, To change the call restriction code, Keypad (dtmf) tones, Keypad (dtmf) tones duration selection, Keypad (dtmf) tones mute during conversation, Sending dtmf tones during a call, Timer and counter functions elapsed time display
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