Editors' Note: The download button opens the iTunes App Store, where you may continue the download process. You must have iTunes installed with an active iTunes account in order to download and install the software. This download may not be available in some countries.
Linphone is an open source internet phone or Voice Over IP phone (VoIP), compatible with the SIP protocol.Linphone can be used with a large number of SIP-compatible VoIP service providers.If you subscribe a VoIP to PSTN (=classic telephony) account to a telecom provider, you can reach everyone that has a "classic" phone line.Alernatively, linphone.org provides free SIP accounts to make audio & video calls over the internet at no cost.List of supported features:-audio with the following codecs: speex (narrow band and wideband), G711 (ulaw,alaw),ILBC, GSM, SILK, G722, OPUS, AAC-ELD-secured call (SIP TLS/SRTP)-video with the VP8 codec (H264 & MPEG4 on demand )-multiple calls-audio conferencing-Address book integration-Call history-DTMF (telephone tones) support using SIP INFO or RFC2833-text messaging
What's new in this version:
-iOS7 binaries-New HD Codecs (OPUS and AAC-ELD)-Re-enabled secure connections (TLS, SRTP)-Graphical fixes