1. Corded headsets
Unify - Wired Headsets
Overview of all currently distributed telephones
Overview of all telephones that have been certified
| Telephone | Connection | Headset |
| 15 / 20 | No headset connection possible | |
| 40 / 60 / 80 | Plantronics U10P or Imtradex AK-1 | Plantronics HW251N HW261N |
| Imtradex AK-1 (included in headset delivery) | Imtradex BasicLine TB/MB | |
| Sennheiser CLS01 | Sennheiser SC 230/260/630/660 | |
Make sure that the DECT headset as well as the telephone run with the most current firmware.