Phone lines – All phone lines must be PTSN

– Disadvantages: Phone lines typically have the most expensive monthly charge.

IP (Internet Communicator) – Most recently approved medium of transmission (2013).

– Advantages: Eliminate phone lines, lower monthly charge.
– Disadvantages: New technology, risk of power outage, expensive initial start up fee.

Wireless/Cellular

– Advantages: No need for internet or landlines (phone lines)