What's the plan now, if my LIR would need to refer to the same contact person? It doesn't make sense to direct any calls to your LIR, if the problem lies at customer network at our LIR's addresses.
In my opinion, for 99% of the consumer market you would have to talk to the ISP of the customer to have any technical or user behaviour problem fixed rather than the customer itself. You may want to have a look at what your national law says about tracing phone calls and how that can be done. In my country the general rule is for the police to get a court order to do so. The current practice in tracing end users trough logs and servers is the same. I personaly can't see the real difference for tracing people on the Internet. I know that there has been a real big difference here, but we have to realize that Internet is becoming an important part of our society so I belive it is important that we act responsibly with regards to peoples right to privacy. -hph