Honlap; https://ring.cx/
Nem próbáltam ki.

Telepítés

-- Linux Mint Rosa (17.1-17.3)

sudo sh -c "echo 'deb https://dl.ring.cx/ring-nightly/ubuntu_14.04/ ring main' > /etc/apt/sources.list.d/ring-nightly-man.list"
sudo apt-key adv --keyserver pgp.mit.edu --recv-keys A295D773307D25A33AE72F2F64CD5FA175348F84
sudo add-apt-repository universe
sudo apt-get update
sudo apt-get install ring-gnome

-- Linux Mint Sarah (18)

sudo sh -c "echo 'deb https://dl.ring.cx/ring-nightly/ubuntu_16.04/ ring main' > /etc/apt/sources.list.d/ring-nightly-man.list"
sudo apt-key adv --keyserver pgp.mit.edu --recv-keys A295D773307D25A33AE72F2F64CD5FA175348F84
sudo add-apt-repository universe
sudo apt-get update
sudo apt-get install ring-gnome

-- Debian Jessie (8)

sudo sh -c "echo 'deb https://dl.ring.cx/ring-nightly/debian_8/ ring main' > /etc/apt/sources.list.d/ring-nightly-man.list"
sudo apt-key adv --keyserver pgp.mit.edu --recv-keys A295D773307D25A33AE72F2F64CD5FA175348F84
sudo apt-get update
sudo apt-get install ring-gnome

-- Fedora 24 (például)

sudo dnf config-manager --add-repo https://dl.ring.cx/fedora_24/ring-nightly-man.repo
sudo dnf install ring-gnome

-- Kézi telepítés
https://ring.cx/en/download/gnu-linux/manual

___

About Ring

Ring is a free software for communication that allows its users to make audio or video calls, in pairs or groups, and to send messages, safely and freely, in confidence.

Savoir-faire Linux and a community of contributors worldwide develop Ring. It is available on GNU/Linux, Windows, Mac OSX and Android. It can be associated with a conventional phone service or integrated with any connected object.

Under this very easy to use software, there is a combination of technologies and innovations opening all kinds of perspectives to its users and developers.

Ring is a free software whose code is open. Therefore, it is not the software that controls you.

With Ring, you take control of your communication!

Confidentiality:
No personal information is stored on a central server. It is therefore impossible to create files on users. Anonymity and respect for privacy are guaranteed.

Security :
Trade security is ensured by encryption methods and the use of certificates. Audio, video and text are converted into a coded message that only the recipient can decrypt.

Freedom:
Ring is an open source software under the GPL v3 license. Everyone can verify the codes and propose new ones to improve the software's performace. It is a guarantee of transparency and freedom for everyone!

Ring is a free software developed and supported by
https://www.savoirfairelinux.com/