Marshall is complaining to Pam. He tells Pam that he is trying to get a hold of Jason, but he forgot his home phone number. So he called his office, but his secretary would not give him Jason's phone number-- because it is against the company's policy to release someone's personal information on the phone to a stranger.

Marshall: Do you know what Jason's home phone number is?
Pam: I can't think of it off the top of my head. You might want to look it up in the phone book.
Marshall: I've checked it already, but it seems that his phone number is UNLISTED.
Pam: Maybe it's under his roommate's name.
Marshall: Well, I guess so.
Pam: Maybe you can call his office and ask his secretary.
Marshall: I've already tried. She won't tell me. She says it's private.
Pam: Oh, that's right. They usually don't release private information over the phone.