Mini-MT User Guide
Revision 1.02
GSM2228UG001 Page 7
4.2 Switches 4.2.1 Push To Call (PTC)
The Push To Call (PTC) switch allows the user to place a call to a number that has been
programmed. To meet GSM specification, pressing the PTC button with no SIM
installed will cause the unit to initiate a “411” call. The application provider will need to
configure the emergency number for its region.
4.2.2 Set Geo-Fence
The switch is used to initiate a geo-fence with a default radius of one-half mile. This
radius may be re-defined by the application provider and is retained in non-volatile
memory.
4.2.3 User-Defined button
The User-Defined button is a programmable button that can be defined for various
functions. Some examples of these functions include: generate a call to a number
different from the PTC button, generate a geo-fence with different parameters than the
geo-fence button, send an SMS of the current location to a cell phone, send the current
location to the server, etc.
4.2.4 Volume Buttons
The Mini-MT has two volume buttons for controlling the audio volume level. These
buttons are functional whether in a call or not. The ‘+’ button is used for increasing
volume and the ‘–’ button is used for decreasing volume.
NOTE: While you are on an active phone call, the volume buttons will
function in both headset and hands-free mode.