What's "Phone Challenge Code"?

Hi, guys:

I downloaded a Dao4 Ban3 Norton Antivirus 2005. The KeyGen with it can make CD-Key, but when need to activate NAV, it needs a "Phone Challenge Code" as a seed to generate Activate code. Anybody knows what it is and where I can get it? Since it's Dao4 Ban3, it may not be a good idear to call Norton's tech support, isn't it? Any info/suggestions will be very appreciated. Thanks.