They essentially turn your computers into “real phones” you can ... then a paid service would make more sense. Look into a free trial or two and try out some VoIP software. If you want to get a feel ...

How to Run a VoIP Speed Test for Free (3 Ways) Your email has been sent Learn three different ways to conduct a VoIP speed test at no cost, plus our best tips for making the most of your results.

Others are more efficient, but sacrifice some audio fidelity. Therefore, you need to choose the right codec for your VoIP software, depending on the network environment and the user preferences.