mumble-voip/mumble — pull request #90 by ngollan (2012-06-07 11:32:45+00:00)
Title: Warn users with missing CELT codecs.

Clients without CELT support but which advertise OPUS support
are notified that they might not be able to use voice.

To disable the warning, set the server's "warnmissingcelt" option
to an empty string.