I tested Jitsi a couple years ago, and it kind of sucked in the way that desktop Java apps often do. But I certainly understand the need for a Skype replacement. Skype started out as a decentralized and encrypted service that was designed to protect the user from warrantless mass surveillance. When Microsoft bought the company, they redesigned Skype as a centralized system with surveillance hooks and backdoors built in. What they got in exchange was permission to broadly abuse the U.S. work visa program. Microsoft then fired thousands of domestic employees and replaced them with foreigners who will do the same job for less money.
Skype was basically turned into a trojan horse (much the like the forced updates to Windows 10 that occurred without the users permission.) Even though this thread is old, it is still relevant, because millions of ignorant and careless people are still using Skype. So just for reference, here are some Skype alternatives. I would welcome experience reports about how these other products are being received by non-technical users in a typical office environment.
https://jami.net
https://wire.com
https://tox.chat
https://matrix.org/docs/projects/clients-matrix
> Waiting for coy.im which looks amazing
Coy seems comparable to Ricochet (which are both desktop text messaging products that look pretty good, but are not widely used yet because they do not run on mobile platforms.)