[Freeswitch-users] OPUS and bitrate

My users are primarily running on 3G networks and are experience some delays/lost packages. I would like to try and force a lower bitrate on the OPUS codec to see if it helps. They are using the Bria client on iOS. In my FS I've set this in opus.conf.xml: <param name="maxaveragebitrate" value="20000"/> But Bria are reporting an average between 30-60kb/s. Shouldn't the setting force a max of 20kb/s and are there more things to consider to get good voice quality on 3G networks and such? Package loss are reported from Bria to be around an average of 1-5%