I don't understand your question.
In the past, and I would think now as well, if you are booking an outcall you would not be able to get anyone to come to see you unless you provided full name, a phone number in your name and an address that matched the phone # and name given. Slightly different for outcalls to hotels, but full name would still be required. If an indy does not do this, then she is asking for trouble. If a client won't provide this, then he should not be seen.
For an incall or at an mp, I do not see the point. At an mp, I don't even see the necessity to have to provide a phone # since it is a much safer and public environment than someone who works alone or does outcalls.