Increased productivity means increased profits and we are all chasing that goal ! and telephone headsets will greatly increase the productivity of staff.
It is important to understand that you also need the right type of headset telephone for the job. This will depend upon how much time is spent on the phone.
Wireless headset phones will allow the user to move about but if this is not necessary why go to that extra expence ? You will also need to decide between monaural and binaural - that is one sided ear piece where the user can listen to others in the room at the same time and two sided where the user needs to block out noises from the room.