One major pain point for any business is when customers aren’t going into a phone call or meeting prepared. If, for example, you’re a lawyer, you need your clients to come prepared with their documents ready. You also know that there are a ton of papers that need to be organized and filed — often with tight deadlines as well — and it’s imperative for the client to have it all readily accessible.
No longer will you need to stay close to your analog desk phone to receive customer calls, or communicate with a colleague. You have the freedom to roam. As long as you have a working internet connection, you can communicate with customers. IP phone systems allow you to take business calls from your smartphone when you’re on the go.

Business voicemail greetings are rarely thought of as a prime way to connect with customers. But just because you're not available doesn't mean you can't make a positive impression on your customers when they reach your voicemail box.
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.