“Hello. I have a CISCO phone, model # CP-8851. Is the headset compatible w/this phone?”

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• Turn your CP-8851 over and look at the ports underneath. If you see a "square" headset port, you'll need to get the RJ-9 version of this headset (SKU:5796300).

  I would recommend:

  • 
    Insignia™ - Landline Hands-Free Headset with RJ-9 Connection - Black

    Rating: 3.6 out of 5 stars with 295 reviews

    3.6(295)

  Answered by Dave 5 years ago

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• Not sure. The headset is made for a landline phone. I am using it with a cell phone, but I had to buy an adapter to work with the cell phone.

  Answered by Anonymous 5 years ago

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• This headset is compatible with phones that have a 2.5 mm jack.

  Answered by InsigniaCustomerSupport 5 years ago

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