A voice calling app is an application that can make and receive phone calls. It can connect you to the Public Switched Telephony Network (PSTN) and VoIP applications so you can reach people anywhere, on any device.
A voice calling application usually includes additional features and functionality, like call transcription, voice recording, interactive voice response (IVR), SIP interfacing, text-to-speech and more.
See more features you can build into a voice app