This device replaces the Hi-Phone Desktop USB It presents a quality cost effective product integrated with: 1) Standard / cost effective budget projects 2) Projects requiring quality 3) Advanced and enhanced telephony features 4) Call center agents and personal telephony applications Hi-Phone Desktop Pro interfaces: 1) Professional RJ12 headset jack 2) 2.5 mm headset jack 3) FXO interface to analog line 4) FXS interface to analog phone 5) USB 2.0 interface 6) Assignable thumb control