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Ring's features include teleconferencing, media sharing, and text messaging.
For more information about Ring, access its source code repository, and its FAQ answers many questions about using the system.
Anything shared in a room is persistently stored with access governed by that room's confidentially settings.
Linphone is a Vo IP (voice over internet protocol) communications service that operates over the session initiation protocol (SIP).
With Linphone, you can make audio and HD video calls, do web conferencing, communicate with instant messenger, and share files and photos, but there are no other screen-sharing nor collaboration features.
It's available for Windows, Mac OS, and Linux desktops and Android, i OS, Windows Mobile, and Black Berry 10 mobile devices.
You can use Riot in your browser (Chrome and Firefox) or via its apps for Mac OS, Windows, and Linux desktops and i OS and Android devices.
In terms of infrastructure, Riot can be installed on your server, or you can run it on Riot's servers.