Linphone is a cross-platform open-source SIP software client for IP telephony, distributed under the GNU GPL license. Linphone is used for audio and video calling and text messaging over the Internet.
Features:
- SIP agent according to RFC3261.
- Instant SIMPLE text messaging.
- Audio codecs: G.711, GSM-FR, Speex. With plugins: AMR and iLBC.
- Video codecs: H.263, MPEG4, theora and H.264.
- DTMF
- ENUM
- IPv6 IP address support
- Overcoming NAT with STUN
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