Maryland requires the two way emergency communication devices now as well.
There is a unit we put in that works with the K-tech ADA phones that allows an emergency personnel to pick up that phone and talk directly to the person in the elevator. I can't remember the name of the unit off hand but I'll check and get back to you. The only hitch if I remembered correctly is that all the phone units had to be on the same service line. That was a grey area for awhile since they were requiring each elevator to have it's own dedicated line which was stupid.