Stay away from CC business if you can... At any cost.

For what you are wanting to do, an asus router with their free DDNS service will be simple, cheap, and work right...

Comcast Business Static requires you to use a complete POS router-fawk-show...

(Not aimed at 00tec, and I apologize in advance for the language, but this has been a huge PITA for our company, and is now costing us monthly revenue because their POS business router that you HAVE TO use to get static ip's doesn't do what it is supposed to.)