Check Fax Numbers For Validity

I have a list of 650 fax numbers of USA. I need someone who is capable of checking the fax numbers to check what is valid and what is invalid. You don't have to send the fax. Just by the tone, you can detect it. This is urgent and have to do within few hours. My maximum $10. The lowest bid wins. Please mention how you are going to do it and how you are going to provide me the report in detail.