ASP_FAX - Version 1.0 ASP_FAX is an Active Server Page (ASP) Custom Script that allows ASP developers to easily send faxes and alphanumeric pages from their ASP powered Web pages. The ASP_FAX Custom Script accomplishes this by taking data from ASP and passing it to a ProtoFax® Server. ProtoFax server is a separate server application that sends faxes and alphanumeric pages. ProtoFax must be installed on your network.