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HOw MANY TELEPHONES CAN YOU HAVE?
All items of telephone equipment have a Ringer Equivalence Number (REN), which
is used to calculate the number of items which may be connected to any other
telephone line. Your Telstra 13150 has a REN of 0.1. A total REN of 3 is allowed, if
the total REN of 3 is exceeded, the telephone may not ring. With different telephone
types there is not guaranteed of ringing, even when the REN is less than 3.