In the past decade, VoIP technology has advanced into a reliable and desirable solution for business phone systems. In fact, there will be 1 billion projected VoIP users by the end of 2017 with only an estimated 6% of the US population using traditional landline phone networks by the end of 2018.
But I bet you want to know why, or at least have facts to back up the claim that VOIP doesn't slow down your business Internet. VOIP, like anything else connected to the Internet, needs the ability to exchange packets of data between two locations, in real time. Some serious bandwidth hogs are Netflix, YouTube, or any sort of video streaming service as those require large amounts of available bandwidth because the files are larger. For example, a video that is 3.2gb requires more bandwidth (more 'room' to travel) to stream at 1080p than a video that is 2.8gp and is streaming at 720p. VoIP works in very much the same way. Depending on the voice quality, there are more bytes to be sent (negligible compared to video, though). VOIP is at a point where even the highest quality voice has a negligible impact on your internet speed.
VoIP (Voice over internet protocol) is the capacity to use the Internet to make phone calls, video calls, and more. It is reliable, affordable, and higher quality than traditional phone networks and services. Now, enough with the grandstanding. VoIP is useful, but there are some things that you should have in order before moving forward with a VoIP service.