Summary: Bought this unit after reviewing both the Plantronics Savy Office unit and the Jabra 9470. This worked fine for the first day, then for some reason I could not walk any farther than 5 ft from my desk and base unit. I am using this plugged in to my MacBook Pro on 8x8's VoIP softphone system. When I called tech support for Jabra we determined that the unit somehow managed to set itself to the "low" setting, which means you can walk no farther than your desk.
Summary: Be advised that this headset does not work with DECT or old-style corded phones. Maybe it works with IP, but it says that it works with any corded phone and with DECT phones, and that's what I needed it for. I couldn't get it to work, so I contacted Jabra support, and they couldn't tell me of ANY corded or DECT phones that it will work with.