Being you're off duty and you call 911 and say I am emt off duty have patient here that needs ambulance at and give address. If that is all you can say then you just say I got to go and hang up. Let dispatcher deal with it. If that person needs your full attention to stay alive, then dispatcher will just have to deal with not getting all info. What is dispatcher going to do not send an ambulance because person hang up/got disconnected? That would be one dam fat lawsuit.