Haven't had vox problems in about a year. I would venture the outages are route related and not server related.
When I had problems a year ago, I found Teamsound to be the best solution. Free, extraordinary clarity (better than telephone quality even for dial-up connections across the globe), anyone can host, multiple configurations available to set up individual flight channels for a squad...
Naturally, your in-game vox transmission doesn't work, but that isn't always bad
