Agora Voice Call is based on the UDP protocol and the sound codec technology of Agora. It provides reliable real-time audio services. For product and release details, see Voice and Audio Broadcasting.
Beckon is the best high quality free call app, allowing you to make international calls for free.
Sample app to join/leave a channel, mute/unmute, and switch between the speaker/headset.
Sample app that sends English spoken words captured by the Agora RTC SDK on Android or iOS to a third-party platform for pronunciation assessment.