This article relates to Cisco IP Video Phone E20.
Q. Can I connect a wired headset to the TANDBERG E20?
A. Yes, there is support for professional grade wired headsets through an RJ9 connector on the TANDBERG E20. For superior Wideband audio TANDBERG recommends Plantronics EncorePro HW291N.
When ordering, remember the Coil Cable (QD to modular phone jack) (Plantronics Part Number: 27190-01).