What cell phone are you using???
To ask my question again in a different way, What phones are you using on your apparatus????
The Celular people here are saying that all manufacturers have discontinued making the permanently mounted type mobile phone.
Does anyone know of a model that is still available????
The primary reason for the horn alert in our application is we, on occasion, need to contact support agencies while on an incident scene. The contact is initiated by a call to dispatch to contact them. They will usually call the IC back and get details.
So someone needs to stay by the phone to answer the call-back.
Sometimes it takes a while for them to call back and it is a waste of manpower to have someone standing by for hours to listen for the phone to ring.