Does anyone know what I might be doing wrong. I replaced a T7100 with a Norstar Polycom Audion Conf Unit. It works just fine, I have 2 IC's assigned, Prime Line set to IC and NO to HF Answerback. However, when I'm on a call and want to transfer or conference, and press the feature button and then let's say 3, I hear a fault tone. Do I have to do something to get the conference/transfer feature to work? Any help would be greatly appreciated. Thanks.