Amazon.com: PC Headset to RJ9/RJ10/RJ22 Phone Switch Adapter with 8 Circuit Lines Switch Compatible for Yealink,Grandstream,Avaya 1600 9600 Series Phones and Most Other Ordinary Telephones or Digital Telephones : Electronics
Male RJ9 Plug to Female USB Type A Headset Adapter Compatible with Plantronics Jabra Sennheiser Wired Headsets
Amazon.com: Headset Buddy 2.5mm VoIP Headset to RJ9/RJ10/RJ22 Phone Adapter (PH25-RJ9a) : Electronics
Headset Buddy PH25-RJ9a - 2.5mm Headset to RJ9/RJ10/RJ22 Phone Adapter