Like others have said, the vast majority of lenders will count it as one large payment now (which will reduce prinicpal and save you hundreds/thousands of dollars in interest). But, you'll still owe money each and every month. You'd still have to pay the full amount on Feb, Mar, Apr, etc. It is just that your loan would end far, far sooner after that one large payment in Jan.
The bank promissed their investors money each month. They aren't going to hire a person simply to set up an account for you, store your overpayments in that account, pay monthly to the investors out of that account, and then close the account when you start paying again. That is just silly on the bank's part when you can easilly do it yourself.
If any bank did it differently, that would be a very rare bank. You'd have to explicitly tell them that the money is going to future interest and not to principal. Meaning that you don't save any money by paying early (your principal was unaffected by this move).