Just tested and yes, voice calls work and use VoLTE. SMS also works as does MMS with the most recent update to mmsd-tng.
I should note that by default our modems don’t have VoLTE enabled so you have to perform a few AT commands to enable it. We have been discussing creating some kind of tool to enable current L5 owners to make the change without having to issue direct AT commands to the modem over the command line.