JK Audio ComPack User Manual page 6

Features
17. Keypad On / Off Switch
This switch disables the DTMF keypad to prevent tones from being
blasted down the phone line during a broadcast. You should leave this
switch in the off position when using the wireless phone or PBX handset
interface.
18. DTMF Keypad
only. You may use the keypad at anytime during a call but keep in mind
that transmit audio is muted during a keypress. This keypad should only
be used to dial calls when the unit is connected directly to an analog tele-
phone line.
19. Phone Line Switch
This switch acts as the switch-hook for the telephone line. The Hang Up
position is the normal on-hook position when you are not using the line or
you are waiting for a call. When you want to place a call, or when a call
comes in, switch to the Dial/Talk position. When using the Handset or
Wireless Interface, the switch should remain in the Hang Up position at
all times.
20. Power Switch
The power switch should be left in the off position any time the unit is not
being used or battery drain will occur. The unit will retain a phone line
connection if the power switch is turned off during a call.
The telephone keypad is equipped for tone dialing
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