Scope:This document explains how to connect a Sennheiser SD Pro1/2 with a Yealink T5 series phone using the EHS40 adapter. Requirements:Yealink EHS40 adapterSennheiser Y-Cord (Included with the EHS40)Sennheiser SD Pro baseYealink T5 series phoneConnecting the SD Pro to the EHS40Connect the single end of the Sennheiser Y cord to the Phone jack of the SD Pro baseConnect the other two connections to the jacks on the EHS 40Connecting the EHS40 to the Yealink T5 PhoneConnect the USB to one of the connections on the back of the Yealink T5 series phones