https://en.wikipedia.org/wiki/Mumble_(software)
I'm surprised the gaming chat programs don't get more crossover use. Well, I'm not surprised that a commercial project has a larger userbase than something that requires you to find a server.
But I am surprised when, say, podcast hosts make jokes about lag or call quality on their Skype connections with guests. There are other applications that solve some of these problems, and I'd think if your main creative product relies on call quality for guests, you might look a few steps beneath the most ubiquitous option. (ie, If you're at the level where you're buying an uncommon specialist's mic, you could probably benefit from comparison shopping for voip implementations.)