Kenwood ProTalk XLS TK-3130 - Manual (Page 18)

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QUIET TALK/ DIGITAL QUIET TALK
QT (Quiet Talk) and DQT (Digital Quiet Talk) are functions that
reject signals from undesired parties that are using the same
channel as you. You will hear audio from the speaker only
when you receive a signal that contains a tone or code
matching the one set up on the channel you are using.
Likewise, when you transmit on a channel set up with QT or
DQT, the receiving station must have a matching tone or code
in order to hear your signal.
You can select a tone or code for each channel. There are 38
QT tones (01 to 38) and 83 DQT codes (DQT01 to DQT83).
After changing the QT/ DQT setting, confirm that the other
members in your group have selected the same tone or code.