Does anyone know if there is a special adapter cord for the Plantronics CS50 Wireless Headset to connect to a 6424D+M? I am having trouble making these wireless headset work with the 6424D+M - I've called Plantronics - they are telling me to connect it in the same manner in which you would connect to an 8410D or an older set without a headset jack, which I have tried & it doesn't work. I know for a wired headset you use the HIC cord, but since the CS50 doesn't have a quick disconnet, I'm wondering if there is some other adapter cord which could be used. Any help would be greatly appreciated. Thanks.