It uses standard phone wiring. However, it probably will require an on-site visit from a phone company technician to test for reliability. You MUST keep your existing phone line, in addition to ISDN service. If you lose power in an emergency situation, you can NOT make calls over an ISDN line unless you have an optional backup power supply. Only your regular analog line will still have power.
Setup takes approximatly two weeks.
Your ISDN line is made up of two 64kb connections. If you are on for two hours at 64kb this will be counted as two hours.