Brian, you misunderstood about the national database itself.
Zvrs and other VRS providers do not own the national database so it's really a neutral national database that serves for all VRS providers in order to complicate for the 10 digital number vp users and callers... videophone users call p2p and/or VRS whether one uses vp200 or mvp or z340 to call.
I'm mere sure that they don't expose those numbers registered in the national database for anyone aka telemarketers to steal and bother you or anyone via vp. Only VRS providers have the database access, I believe. I will ask someone for more information about it to be sure.
However, you (Brian) might have a good point that it should include a disclaimer on that site. I just say that it is really nothing for you to worry about exposing your or anyone's 10 digital numbers even if you or anyone test them into it since that the national database is a NEUTRAL database that no VRS provider even Zvrs owns it, like I previously said.
I think it's still "new" and is in developing now but not so sure yet.