There is a maximimum amount of 'ringers' you can attach to a phone line. This number is available from the phone company (often 5). Each phone has a REN listed on it, which is how may ringers the phone counts as (this is usaly less then 1). If one of you phones is excessivly drawing current from the line, it may prevent the other phones from ringing. Try unplugging the phone that rings, and see what happens.
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