Your home may have a wiring issue, or you may have too many phones with a high Ring Equivalency Number (REN). This number represents the "load" that a phone places on the line. Old phones have high RENs and new phones have low RENs. If the total RENs for the phones attached to an EMTA is too high, the adapter will not be able to support the phones. You can find the REN value on the bottom of your phone. To determine if your phone is ringing back due to a high REN total, eliminate one phone and see if the issue persists.
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