Employment Verification - Former manager, HR

When you list your unit manager of busy hospital on an online application and people start calling to verify, do they usually get through to that manager or do those calls get funneled to HR for simple employment verification.

Treat this as a separate question. What if you work for a company, you list your manager, but that manager is no longer there either?

I have a case where 1 manager is still there and another manager isn't.

I'm just wondering though in case where manager is still there if I can direct people more to HR for employment verification because I'm not sure what manager would say about me. I was working as a 0.1 Tech for a couple of years and actually considering leaving this off my resume.

Thanks in advance.