Employment verification system or talk to manager

[J Zhang]

Hi I'm screening an applicant who works at a large organisation that uses 3rd party employment verification system (which I have accessed via the portal from the organisation's website). My question is, is there any point to ask the applicant to give me their supervisor's number so I can call?  Where I was from (large orgs) managers are pretty strict on what information they can provide for employment verification. Is it the same here on Colorado ? If so, a phone call is not going to get me any more information. Or are there still good reasons to talk with a real person? Thanks for any insights! 

more info: At this point I'm satisfied with all other aspects of the application and credit/background check came back clean and excellent.