# To link the topmost (root) Mumble channel
link <internal Matrix room id> root_channel
# To link a subchannel
link <internal Matrix room id> <name of Mumble channel>
# To link the root channel and send join/leave messages
link <internal Matrix room id> root_channel true
# To link a subchannel and send join/leave messages
link <internal Matrix room id> <name of Mumble channel> true
Like other bridge https://github.com/mymindstorm/matrix-appservice-mumble