Linphone

Linphone is a free and open-source software application that provides Voice over Internet Protocol (VoIP) and video conferencing functionality. It is developed by the French company Belledonne Communications. Linphone allows users to make voice and video calls over the internet, send instant messages, and transfer files. It supports various audio and video codecs, ensuring compatibility with different network conditions and devices.

The software is available for multiple platforms, including desktop operating systems like Windows, macOS, and Linux, as well as mobile operating systems such as Android and iOS. Linphone can be used to connect to any SIP-compliant VoIP service provider or to communicate directly with other Linphone users. Its open-source nature means the code is publicly available for inspection and modification, fostering community contributions and transparency.

Linphone's features include echo cancellation, noise reduction, and encryption to enhance call quality and security. It also offers advanced functionalities like call routing, voicemail integration, and conference calls. The user interface is designed to be straightforward, making it accessible for both basic users and those with more technical requirements. The project also offers a professional version and related services for businesses.