Linphone

Linphone provides a softphone for VoIP calling, video calling, instant messaging, and videoconferencing. It combines these functions into a single application based on standardized SIP protocols for interoperability with other SIP systems. The software supports HD audio and video calls with dynamic adaptation to network conditions, echo cancellation, and codecs like Opus, AV1, H265, and H264. Security features include end-to-end encryption for voice, video, and text, plus post-quantum encryption using Cristals-Kyber. Instant messaging offers one-on-one and group conversations, file sharing, reactions, and ephemeral messages when using the Flexisip server. Call management includes history, forwarding, recording, and multiple concurrent calls. Available for desktops, smartphones, with native iOS and Android versions optimized for mobile environments including push notifications.

Key Features:

• HD audio and video calls with support for Opus, AV1, H265, H264 codecs
• Dynamic media stream adaptation to network conditions
• Software or hardware echo cancellation
• Call recording with playback
• One-on-one and group instant messaging with file sharing and reactions
• End-to-end encryption for calls, messages, and conferences
• Post-quantum encryption with Cristals-Kyber
• Call history, forwarding, and management of multiple calls
• Push notifications for calls and messages
• Interoperability with SIP-compatible VoIP services and IP-PBXs