Kenwood NX-1200A User Manual page 26

Call Interruption [DMR]
Allows a transceiver other than the transmitting transceiver to terminate voice
communications by sending a Call Interruption request message. If a transceiver
receives a Call Interruption request message on the channel where the
transceiver is performing voice communications, the transceiver terminates the
voice communications.
PF Button:
Press the programmed button to send Call Interruption Request message.
Call Response [NXDN/ DMR]
Allows you to send an acknowledge call, upon receipt of the acknowledgment
request message from an individual call.
PF Button:
Press the programmed button to respond to an Individual Call.
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