Vertical Communications DSU and DSU II - Manual (Page 56)

4.6 Displaying Call Cost /Timer
If the installer programs your LCD speakerphone to display call
costing, you can press the COST button on display to show the cost of
the current call. If your system has not been configured with call
costing, the button will show up as TIMER and will display the
running time of the current call.
•
To display the cost of current call (if your system is set for call
costing),
1. After making call, press COST button (display will show cost of
current call).
•
To display the running time of current call (if your system does
not have call costing),
1. After making call, press TIMER button (display will show running
time of current call.
NOTE: When telephone is idle, pressing the HOLD button will display
call Time for the last call, and pressing the HOLD twice will
display call cost for the last call.
Making Calls GCA70–245
4–6 LCD Speakerphone Reference Manual