We recently launched our PC headset adapter with phone jack, but we’ve had customers wanting to use their phone headsets with their office corded phone. So we just launched a 2.5mm to RJ9/RJ1/RJ22 (not RJ11) headset adapter for Nortel, Aastra, and most corded phones, as well as a 2.5mm to RJ9 headset adapter for Cisco, Avaya, and Polycom phones. Note that RJ9, RJ10, and RJ22 phone handset and headset plugs have four connectors, not six like RJ11 plugs. RJ11 is only used to plug the phone into the wall. Be sure to see which of our Headset Buddy adapters fits
PC headset to Cisco phone headset jack adapter – RJ9, RJ10, RJ22 (not RJ11)
PC headset to RJ9, RJ10, or RJ22 phone handset or headset adapter. RJ 11 is not used for headsets.
3.5mm female to 2.5mm male smartphone headset adapter
PC headset to 3.5mm smartphone, iPhone adapter