Plantronics CS500 Series Setup with Cisco Hookswitch (#2243)

Updated by Kamika Royal on Mar 1, 2024

Note: In order for this to work, you have to have Hookswitch Mode enabled in the CUCM (Cisco Unified Communications Manager), which can usually only be accessed by IT. Luckily, if one phone in the office already has a hookswitch on its Cisco phone, then the setting has likely already been put in place for all of the phones.

Plantronics Electronic Hookswitch EHS for Cisco Phones


Installing the EHS
  1. Unplug the power cable from the back of the headset charging base
  2. Plug large end into the Plantronics base (will look like 2 cords fused together)
  3. On the other end of the cord, plug the RJ9 end into the headset port of phone (this is the slightly smaller side of the y-cable)
  4. Plug remaining end into the "EXT" port on Cisco phone (may also say "AUX" or "EHS")
  5. Make sure the compat on base is set to either E or F (Usually E)
  6. Plug the power cable back in to the headset charging base

Assuming the first step (at the very top of the page) was taken by your IT, the headset should be able to now pick up a line on the Cisco phone when you turn it on. If it doesn't, press headset button on the phone to confirm that the headset itself is working. If it is, you may need to check the phone settings or try the steps above again.


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This is the internal support database for Headsets.com. We manufacture and sell office headsets in North America. With over 25 years' experience in the business, we know headsets.

Please use our support database for free headset support, whether you’re a Customer of ours (or not). If you have problems, suggestions, or unanswered questions, please email us at hello@headsets.com (compliments also welcomed 😀)

Looking for office headsets in the UK? Check out Headsets.co.uk.

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What is Headset Answers?

This is the internal support database for Headsets.com. We manufacture and sell office headsets in North America. With over 25 years' experience in the business, we know headsets.

Please use our support database for free headset support, whether you’re a Customer of ours (or not). If you have problems, suggestions, or unanswered questions, please email us at hello@headsets.com (compliments also welcomed 😀)

Looking for office headsets in the UK? Check out Headsets.co.uk.

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