From what I've read: Once upon a time, Wurm had voice chat. I also understand that it no longer has this, but that a certain number of players still use voice either on their village's Discord channel or via TeamSpeak, Mumble or some other voice chat software.
My Request/Suggestion:
How about a client-side mod that adds support for CrossTalk's and/or Mumble's Positional Audio system? Would that be possible? (CrossTalk is a mod for TeamSpeak. CrossTalk's Positional Audio module enables you to hear clients from the position they are in a supported game. In other words: This would give directional and positionally attenuated VOIP in relation to the game world.)
Here's a mod for Minecraft that does this: https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/minecraft-mods/1272675-1-11-mumblelink-forge-smp-lan-mumble-ts3-realism