Changes
* [https://www.linphone.org/ LinPhone]
* [https://ostel.co Ostel], using the CSIP simple client - ''no updates since November 2014''
<br />
Multi-platform
*[http://www.bleep.pm Bleep] messenger enables encrypted calls over the peer-to-peer Bittorrent protocol
*[https://www.silentcircle.com/products-and-solutions/software/ SilentPhone] commercial solution from SilentCircle
<br />
}}
