Try to provide something of possible value and in the exchange get address information.
“We do send out some very interesting information on the position market, salaries, interviewing techniques, career suggestions based on first hand experience,” etc. “So let me have your address and I'll let you get back to work.” After they give this, go for the home number, then go for the birthday. Try to nibble at them and see if you can get them talking. If you can't, you will at least come away with a home address. Also, always look for an opportunity to find the reason for their lack of interest.