I have a Legend phone system and we are a split company with lines 801, 802, 803, 804, and 811 answered by AA1. These work fine, however, the other side of the building does not want AA service on their lines (805-810) 805 is currently being answered by AA2 which I removed and it defaulted to AA1. How do I remove line 805 from being picked up by any AA???? This has been plaguing my staff for weeks now. Please help.