Greetings, it may be possible/likely that the Unity folks who bought out Vivox will finally shut down the old Vivox 4 voice server, even for Second Life now. The message in the attached screenshot came up once, but not the next day. Vivox 4 is already inoperative or Halcyon Worlds that had been utilizing it, and it's not fair if it's still available for Second Life / Linden Lab and not for OpenSim/Halcyon. The Voice on Osgrid is not working, though surprisingly it is working now on Sovaria Estates, a Halcyon World.
Thank you, Shalom.