Battery backup time for these life safety systems is speculative, to say the least. Who will monitor them? Who will ensure that the battery backup is capable of providing four hours of support?
We can't get away with these substitutes for phone lines here for elevators or fire alarm systems. Verizon is fighting it, but they still provide copper facilities to new buildings, supposedly just for these purposes. Our local authorities still allow fake phone lines via cable TV companies' EMTA devices though. Truth is, these inspectors have NO idea what they're looking at. It's the honor system at best, until someone gets hurt and the lawyers get involved.
In these parts, any cell phone calls follow the national standard of ten-digit dialing, even for local calls. Is it possible that the embedded dialing equipment is only dialing the call using seven digits? You don't really need a digit-grabber to count the number of digits dialed.
