SFLphone is a robust, standards-compliant enterprise softphone, for desktop and embedded systems. It is designed to handle several hundred calls a day. SFLphone is available under the GNU GPL license, version 3.

Features highlight

• UI-independant telephony core
• Enterprise scalability functions
• GNOME, KDE and CLI clients
• SIP and IAX2 protocols support
• Multi-line, call transfer, call hold, call recording
• Multi-way conferencing
• High definition audio codecs
• Signalling and voice encryption (TLS, SRTP)
• Pulseaudio support