westchester ny

Hi, I'm looking for A and B tone set for the following agencies Lewisboro VAC Pound Ridge VAC Katonah-Bedford Hills VAC Somers FD Norwalk EMS New Canaan VAC New Canaan FD Wilton FD Ridgefield FD

I have been searching everywhere and i can not find these. I would like to know the frequencies used in Westchester to communicate from ambulance to hospital. Such as Hudson Valley Hosp, Northern Westchester, ect.