Has anyone ever run into this issue. We have 5330 phones and use Mitel's wireless headset just recently we have had a few that when installed the handset no longer works only the headset. Now here is the strange thing took a working headset and handset put a headset that was causing the issue same problem. put the working headset back on the phone now that one only works with the headset. Took the non working and put back on the phone that the handset didnt work and now that one workd fine. I am stumped. we have installed hundreds of these and they work great just cant figure this out.