Yealink EHS60 - wireless headset adapter for wireless headset, VoIP phone - EHS60 - Headset Accessories - CDW.com
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Converter Adapter | Converts RJ-9 to 2.5mm for phones that have a 2.5mm jack., (2200-11095-002) | Use with APP-50, APP-51 EHS for Polycom, Connecting telephone devices to 2.5mm headset mini jack
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Amazon.com: Standard 3.5mm Jack Smartphone Headset Adapter Cable Converter to RJ9 Plug for Cisco Unified Office Telephone 7970 7940 7941 7942 7971 etc : Electronics
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Yealink EHS40 - wireless headset adapter for wireless headset, VoIP phone - EHS40 - Headset Accessories - CDW.com
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