As system designers, integrators, and geeks , we do our homework to become masters in a subject fully before we go headfirst, implementing it in a production environment, right? Well, we aspire to, anyway. But experience says you can never know a hundred percent of what there is to know about a subject... particularly with Voice over IP, which is still changing and evolving. So, once you've equipped yourself with the book knowledge, you hit the field. It's only then that you'll get a chance to discover whether your VoIP project plan has any remaining flaws. But, before you take that leap of faith, there are a few things you should know about: What can go wrong when implementing VoIP in the enterprise?