For anyone who may have the similar symptoms to mine or may otherwise be interested, someone gave me this reply:
Call you phone company and have them come out and put in a ground rod in by the phone box or run a ground line to a cold water pipe, outside the house, you have what's
called crossover, because the system is not grounded ..(IUC Box)
After we got our LSD connection going, we soon learned that we had to have a filter in order to keep all the 'noise' out. But, we still have some feedback. For example, when we (wife and I) talk, we can hear ourselves talk from our own receiver. Sometimes I talk a little lower so its not as distracting. I wonder if we need a different kind of filter or what?