Static IP and customer owned Modem

I just spent $90.00 on a new  Motorola SurbBoard SB6141 modem so I can save $12.00 on my bill by not having to lease one from Comcast.

I got it installed and called comcast to have it activated.  It is working now but I still have a problem.

I have 5 static IPs, When I spoke with support yesterday to activate it I was told it was possible to own my own modem and use it with a static IP, but another department would have to do it and and she would have to create a ticket.  I even spoke to two different people who both said the same thing. Also when I looked on this link for an approved modem there is nothing that says one way or the other whether it can be done, which implies it can. Just a little while ago I received a phone call from Comcast that static IPs cannot be used with customer owned equipment.

So my questions are:

1. Which is the truth, can I own my own modem and still use static IPs?
2. If I can how do I get them set up, I can enter the private IP address of the modem into a web browser but the page I get offers no configuration at all.

Thank You