We have a Nortel Networks phone system model # T7208 ??? and am wondering if there is such a thing as getting a hands free headset that is compatible with this system??? I have tried numerous and expensive head sets and none is compatible with our phone lines here at work. We have a 3 line system if that helps out any. Please advise if there are any options you have. I have issues with my shoulder and cradling the phone is not helping one bit. Thanks again for your help.