Extend the wireless freedom of DECT and 900 MHz headsets to your UC system and manage softphone calls with any CS500 Series or CS500 XD Series headset. The APU-75 provides PC connectivity with one-touch call control across a wide array of softphones.* The APU-75 provides plug and play compatibility with Microsoft Skype for Business. To find out if this cable works with your softphone, visit the Plantronics Compatibility Guide. This cable also works with Mitel 6867 and Mitel 6869 desk phones and may work with additional manufacturers - check the Compatibility Guide for more information. *Download Plantronics Hub to get one-touch call answer/end with most softphones.