User`s guide
ASTRO XTL 5000 Digital Mobile Radio with O5 Control Head 55
Conventional Radio Features
4 Choose one of the following conditions that applies to your 
current call:
• If the receiving unit answers, identify yourself and begin your 
Selective Call.
• If, after a programmable time period, you are not connected, 
the display shows NO ACKNOWLEDGE and a momentary, low-
pitched tone sounds.
Try again, or press the HOME button to return to normal 
operation.
• If you are out of the system’s range, a low-pitched tone 
sounds.
Try again, or press the HOME button to return to normal 
operation.
• If the system is busy when you attempt to make a call, the 
radio you are calling hears a telephone-type busy tone. 
When a channel becomes available, the called radio 
receives a call back and automatically keys up for three 
seconds so that conversation can begin.
5 To return to normal operation, press the HOME button.
Note: If you do not press HOME to hang up, your unit will remain in 
the Selective Call state with the other unit. You will miss all 
subfleet traffic and incoming phone calls.










