You might want to use your fax machine to call another number, such as your cell phone and make sure the call is going through. If that seems to be working, there should be a voice number on the notice you received from the IRS. They will know if there is a back up fax number or if they are having any difficulties with their fax line.
Also, there is an address in the notice, where you can mail the forms, rather than faxing. We do recommend that you follow the directions in the notice and include a copy of the notice when you respond, so it is clear to the IRS why you are sending it.
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