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There is also a cable as referenced as number 1 in the image that is called an Electronic Hookswitch Cable (EHS) which adds the ability to answer and end desk phone calls while away from the desk.
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This connection is what allows the audio to work. Here's the general concept for how these headsets work with desk phones For wireless headsets, there are a couple of RJ9 plugs that will plug into the wireless headset charging base and connect into the back of the desk phone (reference 2 on the image). The benefit of using just a desk phone only headset is that the price point is lower than some of the alternative options. Best headsets for RingCentral Yealink phones.Best headsets for RingCentral Cisco phones.Best headsets for RingCentral Polycom phones.Let's say for example your team is using only traditional phones like Polycom or Cisco and you have no desire to connect your headset to a computer or cell phone, then you will want to check out one of these guides below depending upon which brand of telephone you have.