430-0989 System-425 Caller ID with Message Waiting

Question: What is the master/secondary switch for?

Answer: This switch allows you to use multiple units on the same telephone line. The switch on the main unit should be set to "master", and the switches on the additional units should be set to ""secondary.

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Question: Is there additional information available on-line?

Answer: Additional information is available on our on-line support page for this product.

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