VoIP (voice over internet protocol) is the transmission of voice and multimedia content over an internet connection. Using VoIP allows users to make voice calls from a computer, smartphone, other mobile devices. This is a technology useful for both consumers and businesses, as it typically includes other features that can’t be found on common phone services. These features can include call recording, custom caller ID, or voicemail to e-mail. It is also helpful to organizations as a way to unify communications.
Here is an article about VOIP and it’s many benefits