HT1250 Programming Help

Hello, my squad has four Motorola HT1250s and the frequency we are toned out is shared with a few other agencies. How do I program our HT1250s so that the channel is silent until our tones are dropped? I have figured out how to make the radio "alert" when our tones are dropped the only thing is, the radio isn't silent, I have to listen to the other agencies on that frequency. Does anyone know how to make a channel silent so that the radio only alerts when our tones are dropped and we don't have to listen to the other agencies being dispatched?



Thanks!!