Keep in mind also that there is a specific HIPAA exemption for emergency communications. Which is why ambulance to hospital communications are not encrypted just about everywhere. Also, the rise of various apps such as Twiage, Pulsara, the ESA Alerting app bypass traditional hospital communications systems.
I was starting to reply the same thing then saw yours. I've been in EMS for 21 years, never gave any, never been asked to give, nor will I ever give that information out. It's comments like that the will debunk their whole encryption argument for me.