If you think about it, we really don't care about anything other than who has a contact AOR in the ser proxy because you can't really use your phone unless it's registered and we wouldn't let you register if you have exceeded you allowed number of location table records.
Why would you say this? One does not have to be registered in order to generate INVITES. We have many users set up like this. Those that are wholesale and only need outbound calling are setup like that in our system.
Andres.