RING.CX

Para instalarlo en Ubuntu 15.10

sudo sh -c "echo 'deb http://nightly.apt.ring.cx/ubuntu_15.10/ 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