We heard the noise in the video, but it was not clear if this was being introduced due to something in the environment, the device itself, or possibly the type of connections being used to connect this Konftel device to the room system.
Were you able to replicate this issue while connected to a notebook?
Please ensure that all the proper cables are being used in this setup.
Does the black dot disappear and does not come back until after a reboot?
Does the noise go away after boot-up or does the noise stay there the entire time even while in use during a call?