Liblinphone is a high-level open source library that integrates all the SIP-based voice/video calling, conferencing and instant messaging features into a single easy-to-use API.
This is the VoIP SDK engine on which Linphone applications are based!
Liblinphone combines our media processing and streaming toolkit (Mediastreamer2) with our user-agent library for SIP signaling (belle-sip).
Signaling features :
- user authentication via digest (SHA256 or md5) and TLS client certificates
- multiple call management: hold, resume, transfer and more
- multiple SIP proxy support: registrar, proxies, outbound proxies
- presence using list subscription to presence server
- DTMF (telephone tones)
- interoperability with IMS networks
- suitable for building a VoLTE-compatible client
Media features :
- HD audio calls with support for Opus codec
- HD video calls with support for H.264, H.265 and VP8 codecs
- state-of-the-art adaptive jitter buffer algorithm
- innovative adaptive bitrate control
- ICE support for optimised NAT traversal
- end-to-end media encryption using SRTP, SRTP-DTLS and ZRTP protocols
- post quantum encryption using Crystals-Kyber algorithm
- audio and video call recording
Instant Messaging features :
- one-to-one and group instant messaging
- ephemeral messaging
- voice/video messaging
- delivery and "is typing" notifications
- end-to-end encryption for one-to-one and group conversations
- file sharing, with configurable settings to automatically / manually download attachments
Consult our technical corner to see the list of supported standards, download pre-compiled binaries or the SDK source code, and find more information about available tutorials and documentation.
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