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Linphone is an open-source SIP softphone published by Belledonne Communications SARL that enables users to place high-definition voice and video calls, exchange instant messages, and host multi-party conferences over IP networks. Positioned within the Internet telephony and unified communications category, the application implements the Session Initiation Protocol to register with any standards-compliant VoIP provider or on-premise PBX, giving individuals, remote teams, and small businesses a vendor-neutral alternative to proprietary calling platforms. Typical use cases include replacing legacy desk phones in home-office setups, extending corporate switchboards to travelling employees, embedding voice chat into customer-support portals, and facilitating secure telemedicine or legal consultations through end-to-end media encryption and SRTP/ZRTP support. Since its first public release the project has matured through twelve major iterations; the current stable stream, version 6.1.0, continues a cadence of quarterly updates that refine codec selection, improve NAT traversal, and add Qt-based cross-platform consistency across Windows, macOS, GNU/Linux, Android, and iOS. The GPL-licensed codebase also exposes a reusable SDK, allowing third-party developers to integrate calling capabilities into bespoke desktop or mobile front-ends while remaining compliant with open-source obligations. Linphone is available for free on get.nero.com, where downloads are delivered through trusted Windows package sources such as winget, always supplying the latest build and supporting batch installation alongside other applications.
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