I like the stuff that works everytime and that isn't the newest technology. Keep it simple and keep your costs down. Voip may make sense it should keep your long distance cost down. If you can't justify it that simply you probably don't need it. Costs kill small businesses.
VOIP makes sense for a lot of business simply because you're already paying for the internet service. Some ISP's offer VOIP service as a part of your internet service.