redcom

I always here the control channels 2,3,4. But when I look up the frequencies on Radio Reference it says: 155.26500 WSX402 RM 123.0 PL Control 2 Control 2 (Zones 4/5/6/8) 154.14500 KME300 RM 146.2 PL Control 3 Control 3 (Zone 7) 154.17500 KBF851 RM 156.7 PL Control 4 Control 4 (Zone 3/9)...

I live in Sonoma County, California. I was just wondering what are the frequencies for Sonoma Life Support (ambulance). I can hear 154.3100 for fire but never hear the ambulances talk to their dispatch. I know most activity is done on RedCom. Any info is appreciated.