26
Modifying the Type of Call
The infrastructure can modify the type of call you started. 
For example, you might start a half-duplex Private Call, and 
the infrastructure could modify the call to a Group Call. 
The terminal will alert you of the modification and will display 
the following messages, depending on the type of call:
• Call Modified (to full-duplex)
• Call Modified Use PTT (modified to half-duplex)
Continue the modified call depending on the type of call.
Receiving Calls
The MTM800 Enhanced will automatically receive the 
incoming call. Additionally, if Inactivity Revert Mode is 
enabled, the MTM800 Enhanced returns automatically to the 
Home display, after that call ends.
Your MTM800 Enhanced will alert you of an incoming call 
depending on the setting you selected in the Tones menu 
option (see page 117).
During message editing, you will be alerted of an incoming 
Group/Emergency/Broadcast Group Call if configured by 
your Service Provider.
Pre-emptive Calling
Pre-emptive calling is particularly useful when you need to 
speak urgently with a user whose terminal is busy in a non-
emergency voice call.
• Half-duplex Private Call modified from direct setup to hook 
setup: 
a ringing tone will alert of the change.
• Half-duplex Private Call modified from hook setup to direct 
setup: 
there will be no indication of the change.
Inactivity Revert Mode will occur if configured by your Service 
Provider.