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English
Periodic Alert
Periodic alert indicates the missed calls and the unread messages. 
For each indication the unread message tone is played with the 
orange LED color.
This feature can be disabled/enabled by the user. Press   
and select > Setup > Tones > Periodic Alert also to set the period 
of time between the indications.
Key, Knob, and Button Overview
On-Off/End/Home Key
• Press and hold to turn the CEP400 On/Off.
• Press to end calls.
• Press to return to the Home display.
Simplex Private 
Pre-emptive Priority Call 
(PPC) ring
Every 4 seconds, 
until the call is 
answered or 
rejected.
Duplex Private PPC ring
Every 4 seconds, 
until the call is 
answered or 
rejected.
Limited service
Once, upon entering 
limited service.
New mail received Once
New Group Call Once
General
Volume setting (earpiece, 
keypad, speaker)
Continuous
Volume setting (ringer)
While setting the 
volume.
Transmit Inhibit (TXI) 
 
Once
Description Type Repeated