I am new to VoIP, and am wondering what software I need on my router to run CME. Is it possible to have CME running on a router that has the vpn/firewall/ips IOS on it? Do I need anymore software on there to make VoIP work? I have 2 FXO and 2 FXS cards on it. I also plan on attaching a VoIP phone to it. Thanks for any help you can provide.