You need to find out the Ringer Equivalence Number (REN) of the phone port on your adapter. It should be in the technical data in the manual somewhere.

Each phone (or fax, or whatever else) should have a REN nubmer on a sticker on the device.

If the combined REN of all the devices attached is greater than that supported by the adapter, it may not work correctly. The most common failure is that on an incoming call, all phones might not ring.

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