I separated out my jobs within the same company, using the exact same contact information. As long as they can verify your title/salary, you should be okay. Good luck!
I put my manager's phone number and sent her exactly what I put in the application so she can use that when the school calls (if they do) to verify the information.
Hmm. It's up to you. You should let the HR contact know what you put down either way, just in case your manager routes the call to them. Also, it depends on your company structure. We don't have a "main office line" so I had to put down my mangaer's number.
Either way, I don't think it's a big issue as long as they can verify what you put down on your application.