How to send and receives faxes in Outlook '07 w/ free vonage fax l

I just signed up for Vonage business phone service and get a free fax line
that I was hoping to ultilize and keep up the *free* theme with Outlook. I'm
running XP, with Office 07. I done the following in Outlook 07 = tools,
account settings, new (on email tab) then added fax mail transport - mapi.
Then go back to Outlook and hit new, interenet fax, I know get a message - to
use fax service to send your fax, you must first sign up with provider... and
they give you this link =
http://office.microsoft.com/en-us/ma...035751033.aspx

Here is the thing, I already have a free # with Vonage...Any way I can make
this work? I imagine I missing something very simple...

Look foward to your replies and thank you in advance.

Tom