Hello.

I think maybe the confusion is happening because of the generic use of the word "Prostar" to refer to so many different types of systems.

I had the same problem explaining the concept of DID to a tech guy who wanted to buy a true DID fax server.

There is True DID and there is routing based on the last 4 digits sent down a PRI/T1 which is used to route calls in an office but is not the same thing as true DID. However, both methods are commonly referred to as DID.