Amazon.com: CablesOnline, 1ft 3.5mm Jack to RJ9/RJ10 iPhone Headset to Cisco Office Phone Adapter Cable, IP-CS01 : Electronics
VXi ProSet 21p Duo Stereo Telephone Headset, vxi-203032 | Wideband Audio Headset | Plantronics Compatible | Avaya, Nortel, Cisco, IBM, Mitel, NEC and many more
Call Center Hands-Free Noise Cancelling Corded Monaural Headset Headphone for Desk Telephone with 4-Pin RJ9 Crystal Head | Oriental Trading
NEC DSX Systems Wireless Headset Adapter 1091054
Coiled 2.5mm Headset Adapter for Cisco IP Phone
Standard to 3.5mm 2.5mm Male Adapter for Telephone Headset | eBay
Amazon.com: VoiceJoy Headset Adapter Converter 3.5mm Plug to Female RJ9/RJ10 Headset/Handset Plug for Most Office Phones : Electronics
Mobile Headset Adapter for Nortel 7200 series phones
Buy Wholesale China Usb To Rj9 4p4c Telephone Handset Audio Adaptor/phone Headset To Pc Voip Converter & Usb Cable To Rj11 Female at USD 3 | Global Sources
VoiceJoy Volume and Mute headset adapter +RJ9 plug headset Noise canceling Telephone headset call center for All office phones|headset call center|call centerheadset noise cancelling - AliExpress
VXi ProSet 10v Mono Telephone Headset, vxi-203042 | Wideband Audio Headset | Avaya, Nortel, Cisco, IBM, Mitel, NEC and many more
CISCO Headset Adapter for 3.5mm Headphones | RJ9 to 3.5mm Adapter
Amazon.com: 3.5mm Headset + 2.5mm + USB Adapter Headset Microphone for Business Skype Work from Home Call Center Office Video Conference Computer Laptop PC VOIP Softphone Telephone Noise Cancellation Headphone : Electronics
Amazon.com: Headphone Earpiece Jack Adapter Cable for Cordless Phones: 2.5mm Male to 3.5mm Female (for Smartphone Headphone) Cordless Phone Hands-Free Headset Adapter : Electronics
Amazon.com: MAIRDI Telephone Headset with RJ9 Jack & 3.5mm Connector for Landline Deskphone Cell Phone PC Laptop, Office Headset with Microphone for Call Center, Work for Cisco Phone 7941 7965 6941 7861 8811 : Electronics
USB Plug to RJ9 Headset Adapter For Headset Work with Computer PC Laptop Avaya Nortel Yealink Cisco VIOP POE IP Telephone Skype Video Phone - Walmart.com