Linphone

Linphone is a comprehensive open-source SIP (Session Initiation Protocol) phone that specializes in secure communications through voice and video calls as well as instant messaging. Built for both mobile and desktop platforms, Linphone integrates various components such as Liblinphone, a high-level VoIP library, and Flexisip, a modular SIP server implementation that supports features like proxy, presence, and conference. Users can benefit from advanced functionalities like end-to-end encryption and HD audio/video calling, which enhance the security and quality of communication.

Key features include:

• Flexible Architecture: Linphone separates the user interface from the core engine, allowing for customizable UI development tailored to user needs.
• Multi-Device Support: The application can be utilized across various platforms, ensuring accessibility for both mobile and desktop users.
• Encryption Solutions: Incorporating modules like LIME for end-to-end encryption and Post Quantum Cryptography, Linphone addresses modern security challenges in communications.
• Developer-Friendly: Through Liblinphone, developers can integrate SIP calling and instant messaging functionalities into their applications with ease.
• Robust SIP Server: Flexisip provides a scalable SIP server solution ideal for cloud and embedded applications, including essential features for mobile notifications.

Linphone is designed with user authentication and secure communication in mind, making it a reliable choice for both developers and end-users seeking secure VoIP solutions.