Setting up my new Modem/Router

I have just purchased a new Netgear N600 WIFI Cable Modem Router, Model C3700.    The instructions say "Set Up Your Internet Service ",  contact your internet service provider and inform them your Modem Router model number is 3700.  The instructions say I can do this Online by going to Website: WW2.cox.com.  However, when I go to that Web site it says it is "DOWN".

So, do I have to call Cox to get my model hooked up ?

Jim Garretty