I can say that without a doubt the D10, D11, and D12 receivers all with the latest software suffer from the "null" Caller ID bug. I also have an R15 and and HR20 and neither have the problem. I have also moved the R15 to where the D1x receivers are installed to verify that it was not the phone line. It is not. BTW, I do get DSL from my phone company and I have a "whole house" DSL filter installed.