We've assessed the plethora of business phone systems available, taking into account pricing, contract terms verses month-by-month rates, mobility options, customer service, customer and expert ratings, ease of use, and the company's standing with accredited reviewing entities like the Better Business Bureau. We also kept the following musts in mind:
This document has discussed the reality that voicemail is often tied to a broader phone system.

Most VoIP solutions will require stable and consistent internet connectivity at all your office locations where VoIP will be used. At the very least, your business phone system must have access to a business-class internet link, so discuss these needs with your company's internet service provider (ISP). This should be a dedicated link through a dedicated router if you expect your phone calls to sound as if they were coming from a business and not someone's home Skype connection. At a minimum, it's important to have a router that can create virtual LANs (VLANs) and also has the ability to encrypt your voice traffic. These days, you need end-to-end VoIP security for any call.
In most cases, landlines would cost exponentially more for the same set of features. In some cases, a landline phone system may simply not be able to match the feature set and value of a VOIP line, regardless of cost. If you have found yourself looking at your small businesses’ phone bills lately and wondering what you can do to lower the cost, VOIP might be the answer.