From Inside The Grey House:
At the moment, he needed to have a private conversation with Natalia. The sequence of numbers he entered into the device controlled the microphones and cameras for this room only. He knew the code for every room, had programmed them with Vincent. When the code was entered, it turned off the microphones and cameras. In the security room the only thing the guard would notice was the video screen changing to a different room. Rebecca was there now watching the screen intently. She had convinced the on-duty guard to take a break. Joseph ordered her to the security room to distract the guard; she decided to take over the watch.