I have been using Packet8.net for a while. You can buy their phones at Office Depot or from the gentlemen above that has a reseller business. I believe this is the best low cost business system out their if you are a small business of less than 5. If you have 20 or more people then look into cisco hardware that will integrate into your phone system if you are hooking up multiple locations to a larger organization. The only downside to voip so far I have seen is your internet connection speed and packet size. Send me an email to equiprep@mindspring.com and I can tell you more about it. I do not resell voip so I have no stake in it just personal experience.