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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