Though considered outdated, POTS is still in use for fax machines, alarm systems, and areas lacking broadband connectivity. VoIP systems often interface with POTS via analog telephone adapters (ATAs) or FXO/FXS gateways to support legacy devices. While VoIP offers cost savings, scalability, and feature-rich communication, POTS excels in reliability—it works during power outages and has predictable call quality. Many businesses transitioning to VoIP maintain a few POTS lines for failover or regulatory compliance (e.g., emergency lines in elevators or fire systems). Understanding how POTS and VoIP interoperate helps organizations preserve continuity while embracing modern telephony.
What is POTS (Plain Old Telephone Service)?
POTS refers to the traditional analog voice service offered by telephone companies, using copper lines and powered by the central office.
