Looking for the law and phone advice

Here's what I need to look up tonight:

Laws - NC and Federal regarding "emergency" telephones in elevators.

• A) Do they need to be hard-wired? (to meet legal requirements)
  
• B) Dependent on point "A" but can they be VoIP?
  
• C) Who make a VoIP "basic" handset that looks like a "basic" phone you'd find in an elevator?
  
• D) Maybe it would be nice to have glowing "911" and "Maintenance" buttons
  
• E) Who makes a 5-10 port 10/100 switch with PoE? Anyone?