“Will the cs6909 expansion handset work with the cs6649 phone system?”

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• Need to look at the instruction manual, it will tell you. If you don't have one, go to the manufacturers web site, it will be there.

  Answered by MrDDuck 8 years ago

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• The compatible accessory handset for CS6649 is CS6609.

  Answered by CommunityAnswer 8 years ago

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