Is this the same thing as phone wires picking up an AM station? Sometimes 
I can clearly hear an AM radio station overlaid with a conversation on 
the phone (only on my end, the other person can't hear it). The phone 
company told me that there was nothing I could do about it, but I've 
heard that a choke coil on my side of the network interface should reduce 
it. (haven't had a chance to try it yet) How exactly is this happening?