This product / kit contains two (2) cables that will allow you to use your iPhone, Smartphone, PS4, Xbox One or PC Headset with single 3.5mm plug or separate mic and headphone plugs on your Cisco IP Phone The RJ Plug of this adapter cable should be connected to RJ Port with a Headphone sign of your Cisco IP Phone (see one of the product pictures) ienza is a registered trademark. Use of the ienza trademark without the prior written consent of ienza, LLC. may constitute trademark infringement and unfair competition in violation of federal and state laws.