To create a VoIP calling application, you must: choose a development platform (iOS, Android, or cross-platform), choose a VoIP signaling protocol (e.g., SIP), include an appropriate audio codec (e.g., Opus), create the user interface, include basic functionality such as setup of call, audio streaming, and call management, and include appropriate network handling to ensure the call quality in different network conditions; this typically means using APIs of the target platform and a backend server for connection and user data management.
For more details for step by step process: https://dev.to/alexsam986/how-....to-build-a-voip-call
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