Linphone – open source VOIP software

Linphone is a web phone: the software lets you make two-party calls over IP networks such as the Internet, freely, with voice, video, and text instant messaging.

Linphone uses GTK+ for GUI and can be also run as a console-mode application (linphonec).

The software is available on mobile and desktop environments (iOS, Android, Linux, OS X, Windows Desktop, and Windows 10 UWP).

The software is compatible with the well known and popular Session Initiation Protocol (SIP). SIP is a protocol for establishing Voice over IP calls. It’s an open standard, published by the IETF organisation, who made the vast majority of internet protocols. It’s inspired from e-mail and http.

Features include:

• Attractive graphical interface.
• Audio & HD video calls.
• Multiple calls management (pause & resume).
• Call transfer.
• Audio conferencing (merge calls into a conference).
• Instant Messaging with message delivery status (IMDN).
• Pictures and files sharing.
• Contact list.
• Call History.
• Display of advanced call statistics.
• Echo Cancellation.
• Call quality indicator.
• Secure communications for end-to-end encrypted voice and video communication: zRTP, TLS, SRTP.
• Supported languages: English, French.
• Account creation assistant.
• Audio codecs:  OPUS, SILK, SPEEX, G722, AMR-WB (G722.2), AMR-NB, GSM 6.10, ILBC, G729, ISAC, BV16, G711, Codec2.
• Video codecs: VP8, H264, MPEG4.
• HD video support.
• Integration with push notification (requires compatible SIP server, linphone.org sip service has push enabled).
• ICE support (RFC5245) to allow peer to peer audio & video connections without media relay server.
• Low bandwidth mode for audio calls over 2G networks.
• Call handover across network access type change (start a call in wifi and continue in 3G).
• Ability to configure multiple proxy accounts with different transports (UDP, TCP, TLS).
• IPv6 (dual stack and v6-only support).
• DTMF with RFC4733.
• Compatible with telephony by using an Internet telephony service provider (ITSP).
• Internationalization support – including English, Arabic, Dutch, French, German, Japanese, Russian, and Traditional Chinese.

Website: www.linphone.org
Support: Documentation, Snapshots
Developer: Linphone
License: GNU General Public License v2.0 or proprietary and commercial license to be used in closed source applications

Linphone is written in C++. Learn C++ with our recommended free books and free tutorials.

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