In addition to the thread about the PrivacyManager i discovered that ConferenceUtils also creates a new ServiceDiscoveryManager to check if a password is required. A second ServiceDiscoveryManager will, in addition to the standard Manager, reply on all disco#info requests so they are replied twice.
I attached a patch to get the instance of the standard ServiceDiscoveryManager instead of creating a new one.
ConferenceUtils_ServiceDiscoveryManager.patch.zip (493 Bytes)