Len, regarding your elevator phones growing legs... half of the elevators that I have connected have a built in phone (air holes drilled in the metal for voice path) and a built in flush mount button, so that stealing it would require taking off the entire panel and then the security casing around the electronics.
You should talk to the elevator company and see if they offer any built in products. The fact that the phones disappear shouldn't stop them from finding a solution to the safety issue.
I have had people request 911 as the destination, but we always suggest a monitoring company.
