Sennheiser Siemens, Unify, & Aastra EHS Setup (Cat #1786)

Updated by Hayden Everly on May 23, 2024

Sennheiser EHS for Siemens, Unify, and Aastra phones

Please note this EHS looks very similar to the regular Sennheiser connector cord. The EHS is a longer round cord, while the connector cord is a shorter flat cord.

  1. Plug the end with the green sticker under the "phone" port in the cube
  2. Plug the other end into the Headset jack of the telephone
  3. Set compat to A and moved dipswitch #1 down (bottom right in back of cube)

Note: You may need to remove a plastic piece from the headset jack of the Mitel 6920 phone

Siemens II mode: A special way to program a Sennheiser base to work with a Siemens hookswitch. Here are the models of Siemens that need to be in Siemens II mode to use a hookswitch:

  • OptiPoint 410 advance
  • OptiPoint 410 standard
  • OptiPoint 420 advance
  • OptiPoint 420 standard
  • OptiPoint 500 basic
  • OptiPoint 500 standard
  • OptiPoint 600

Here’s how to get into Siemens II mode:

  1. Leave power plugged in
  2. Moved all 6 dip switches down
  3. Press black dimple button twice
  4. Put dip switches 2 through 6 up in order (2, then 3, then 4, then 5, then 6).
  5. Leave dip switch 1 down!
  6. The right battery light will begin to flash.

Allow a full 30 min for the reset to fully take. If you still need help after that, give our Product Supprot team a call at (800) 923-0018

Sennheiser Aastra EHS setup diagram

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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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