Somewhere along the way, I encountered a page that asked for my fax number, and had a check box saying, "I do not wish to receive unsolicited faxes." Since the fax machine shares the voice line, I checked the box. Then I thought that since I didn't want to get any faxes, and there was no place to denote "call first" in their itty bitty section for the fax number, I left the fax number blank.
Upon clicking "next", I was dumped back to the previous page again with a note at the top saying that some material was missing and I should rectify this before continuing, and to consult the list as to which required items were absent.
(For those of you who are interested, you can download DialUp Networking
Update 1.2 from http://www.microsoft.com/windows95/info/dialup.htm)