4P4C RJ11 Female to Double 3.5mm Male Y Splitter Cable for VoIP Headse
Cable for Heil headsets 3.5mm jack to 6p6c modular RJ11 for Yaesu FT-7800 FT-7900 FT-8800 FT-8900 FTM-100 FTM-400 - TechnoFix UK
RJ11 to RJ11 Headset Adapter – Headsets4business
6P4C RJ11 to 3.5mm Audio Plug| Alibaba.com
VoiceJoy Headset Adapter/Converter VoIP 2.5mm Headset to RJ9/RJ10 Plug ONLY for Cisco Phones,Cisco 794X 797X 796X 88XX 99XX Series : Amazon.co.uk: Electronics & Photo