I too am having the same trouble. I have 10-Sony B65's and one Sony T-60 on one fax line all are from a dedicated 66 block and all Sat's are located in the same rack (MAPI) and all share the same power phase. If anyone has found a work around for let me know this is a huge problem. I had to unplug all my sat's phone lines just to keep the line free. Does anyone think it has anything to do with the fact that we have 1 fax machine in the same line as well.