Always remember to post (as a bare minimum) your Full Vicidial Version With Build. Probably a Very Good idea to also post your installer full version as well, since this is obviously an installation issue/question.
Also, moving to the support board as this is not a "general discussion" question.
From another post:
http://eflo.net/VICIDIALforum/viewtopic ... 10#p150862The "XXYYXXYYXXYYXX" means that VICIdial/Asterisk cannot find the participant channel in the Meetme room to alter its audio properties. It might be a configuration issue, if the asterisk version is not set properly on the Server Modify page, or it could be a code version mismatch or another version somewhere else. Since I cannot duplicate your problem it would be difficult to diagnose remotely.
Of course, this reference is for meetme, but if that string means "can't find conference ..." in meetme, it may also mean that same thing in confbridge.
Perhaps if you provided more than just that single error code (asterisk CLI from the entire login/call/volume change ...?) it might help.
Also: Why confbridge? Why not meetme? (Not being a smartass here, not suggesting you should use meetme, honestly asking if there's a reason since that response may provide more insight into your situation!)