Working adaptive bit rate is the killer feature of Skype over SIP. Tox/qTox is not using any adaptive audio/video bit rate. I found out why tox audio quality is so bad compared to Skype.
Skype, especially for Linux, is a train-wreck since it got into Microsoft's fangs - though I hear that the Windows version turned into plain crap as well. I monitor my bandwidth usage in real time I know whats available. I will be here with an another article soon.
I also tested Tok Lite (doesn't support calls), which is a fork of the official Antox Android app. The official mobile apps while outdated still work. toxdns as a whole is deprecated and toxme.io will soon be dropping dns and moving entirely to the https api for lookups. The most popular desktop applications are uTox and qTox. toxdns1 should have been removed from qTox a long time ago. Tox believes in forcing encryption wherever possible. It is completely relies on encrypted peer-to-peer networking, also it is fast, secure and safe way to communicate with your friends and buddies. DNSSEC does not provide confidentiality of data in particular, all DNSSEC responses are authenticated but not encrypted. However, unlike skype, Tox doesn't rely on any central server. heavy graphical glitches when being used on a Tablet and even on my phone it is crash-happy as hell. Tox is similar to Microsoft's Skype application. The only thing which doesn't work for me at all is the Android app (Antox). I like that it works, in layman terms, on the same principle as, for example, syncthing (I know that's not really correct - just to keep it simple) - mesh network, no central authentication facility, encrypted payload ( while (NSA) ), completely open source, easy to use and, in case of qTox, a nicely designed UI. From there, use your preferred text editor through sudo to create a new list file in that directory. To get started, cd to the directory containing the configuration files for external repositories. I happened upon "Tox" through an article discussing the Inventors showing it off at an FOSS conference - accidentally coincided with me looking for a "decentralized messenger". Essentially, it functions the same way, though, it’s just a bit more manual.
My primary usage is text-only messaging - I don't have a webcam or mic connected to my computer at all.
I'm using qTox for quite a while now and am quite satisfied.