172
• Talk Prohibit 
• System busy
• Time-out timer expire
• Called MTM800 
Enhanced not available 
or busy.
Until you release the 
PTT
Call disconnected or 
failed due to network
Once
Wrong number dialled.  No tone
DMO Entering
 
Once
DMO Exiting Once
Local site trunking 
—Entering/Exiting 
Once
Phone ring back (sending) Every three 
seconds, until the 
called user answers 
or call is rejected
Phone busy Every 0.5 seconds
Status message sent to 
the dispatcher or failed.
Twice
Incoming Calls
Status message 
acknowledged by the 
dispatcher.
Four times
Your MTM800 Enhanced 
received a Group Call 
without gateway. (setup 
only)
Once
High Priority Group Call 
received
Once
Emergency Alarm sent or 
received
Twice
Emergency Alarm failed Four times
Emergency Call received  Once
 = High Tone;   = Low Tone
Description Type Repeated