Most POTS replacement solutions on the market today support only 1–8 PSTN lines. This creates significant deployment challenges in environments such as apartment complexes, universities, and senior living communities, where dozens—or even more than 100—PSTN lines are required.

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Modem technology originated in the 1950s and was among the earliest communication technologies for connecting computers. In 1958, AT&T released the Bell 103 modem, which achieved a transmission rate of 300 bps, paving the way for data transmission over the PSTN network and enabling remote computer communications for the first time.

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To this day, fax remains an essential method for transmitting legal and official documents in the United States. It is still widely used for medical prescriptions, legal notices, and government communications. Therefore, the ability to reliably support customers’ existing fax services is a critical factor in the successful deployment of any POTS replacement solution.

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An alarm panel is the core component of an alarm system. On one side, it connects to various sensors (such as fire or intrusion detectors) via a two-wire bus. On the other side, it connects to the PSTN network through a telephone interface, enabling communication with a receiver.

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Elevator emergency phones are still fundamentally voice communication devices, making them one of the simplest POTS replacement scenarios. However, even in this seemingly straightforward application, significant challenges can arise if the technical and regulatory requirements of the industry are not fully understood.

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The Federal Communications Commission (FCC) issued Order 10-72A1, mandating that all traditional POTS lines in the United States be replaced with alternative services by August 2, 2022. (Read the latest updates from the FCC.)

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