Understood. Depending on your budget, and how far away from the phone you need to go, you can use a typical Bluetooth headset, as used with mobile phones, with a range of about a hundred feet, or, for more money, you can get a DECT 6.0 wireless headset from Jabra or Plantronics, with a range halfway down the block. The DECT 6.0 headsets have far better sound quality and range, and batteries that last through a full day of calling. I use the Jabra PRO 9470, for example.
Hello Direct is a good place to shop and learn more about these products.