Can any of the features of the DIS-CCU central control unit be added to an existing central unit?
Yes. As of 2016, updated firmware is available at no charge, and adds some new features to compatible legacy central units. The CU 5905 central unit adds the following features: 1) additional browser pages for the Chairman and Display, and 2) Input 2 can be configured as a standard audio input instead of an Emergency Evacuation Message input.
The CU 6105 and CU 6110 central units add the following features: 1) control of conference units for up to 250 participants, 2) additional browser pages for the Chairman and Display, 3) microphone voice activation (VOX mode), 4) basic voting.