POTS lines are the old copper wire lines that have provided residential and business phone service since Alexander Graham Bell invented the telephone in 1876.
POTS (Plain Old Telephone Service) is an acronym used by telecommunication carriers to refer to these legacy analog lines. POTS lines are used for more than just regular voice calls. They also service analog devices such as security alarms, fire alarm panels, FAX lines, building and gate entry systems, public safety emergency phones on campuses, elevator phones, point-of-sale systems and more.