There is a search messages button near the top of the page. Learn to use it You might try the national board It's a subject that has been discussed there too.
http://www.theeroticreview.com/discussion_boards/searchMessagesResults.asp?FromPost=1&MessageID=&BoardID=33&SortBy=DateCreated+desc&Search=screening&SearchType=1&Author=&DayFrom=30&DayTo=0&submit.x=19&submit.y=14

the information that this site provide via reviews. Use reviews to select quality ladies that interest you. Do not worry about calls at work, the best ladies are discrete and would not provide busy bodies with gossip material.

What I do is ask for your mobile #, your first and last name (when we meet I quickly check ID to see that the name you gave me and the face on the ID match) and either a website of a provider that you've seen before so I can call her and ask her if you're o.k. OR you can instead give me your business # and I'll call and ask for you.  If the receptionist asks for my name I make one up.  If you're not in, I don't leave a message, if I'm directed to your mailbox, I don't leave a message.  If you answer I just tell you to email me when you get a chance.  

I don't think that you'd have any problem with giving this information if you chose a provider who has lots of good reviews, a website, an e-mail address and a phone number.  She will act professionally and her main objective is to keep making money so she doesn't "exactly want anyone to find out" either, she just wants to assure that her safety isn't jeopardized.