[ALL DW PRO1 DISCONTINUED] Yealink Model #s EHS 40 is compatible with : SIP VP59, T58A, T57W, T53W, T54W, T53, T48S, T46S, T42S, T41S PLEASE NOTE #1 : If an expansion module has been connected to the SIP- T58A, T57W, T54W, T53W, or T43 IP phone, you can connect the EHS40 to the expansion module Sennheiser : Grab the adapter box, and the Sennheiser Y-cord (top of the y-cord has an RJ45 and RJ9 connection, the bottom of the y-cord has an RJ45 connection) What is in the box : Yealink adapter box that has a USB cord coming out of it, 1 Sennhieser Y-cord, 1 Plantronics Y-cord, and 1 Jabra Y-cord. 1) Connect the bottom of the y-cord into the green PHONE port in the back of the cube 2) Connect RJ45 and RJ9 end of the y-cord into the 2 available slots in the Yealink adapter box 3) Plug the USB cord coming out of the adapter box into the USB port in the phone 4) Move D/S #1 down and ABC switch on A Does not immediately give ring detection. To get it to work correctly, they will need to get to…