The problem there is that VoIP traffic is much more sensitive to network bumps and potholes than most general office traffic. That translates to garbled conversations, difficulty connecting over Wi-Fi, or (worst case) dropped and lost calls. If your business is small and your network is essentially contained in one or two wireless routers, then your configuration and testing headaches might be fairly easy (though still there). For medium and larger networks, these tasks can be complex and time-consuming, which translates into added cost in terms of man-hours.
Providers of virtual phone numbers allow business owners to choose a number for their business which can be used with the cell phone or landline already used for personal phone calls. The seven virtual phone number providers examined in the article below have proven to be the best options of the many providers operating in the industry. For consumer convenience, each of the seven companies has been carefully evaluated based on the price of their services, available features, and services offered to determine which of the companies are the best of the best.

14. "Hello, you've reached the Sales Department at [Company name]. All of our representatives are currently helping clients [insert goal such as, 'achieve 40% growth through streamlining HR operations'] and are unable to take your call. Please leave your name, company, and phone number and we'll give you a call back ASAP. Thank you!"
Ooma Office has received a lot of positive feedback. They offer a one-plan option and robust features. The only downside to the company is that its hardware costs aren't included in its plan. There have also been some complaints of dropped calls. Overall, Ooma Office is very beneficial to small companies that serve a variety of industries.