A cover assembly for a floor-mounted enclosure or in-floor box includes a lid that remains flush with the floor and covers the in-floor box while permitting egress of electrical cables connected to receptacles housed in the box. The system includes a first electron optical system array having electrodes with a plurality of rectangular apertures, and a second electron optical system array having electrodes with a plurality of rectangular apertures. The first and second connectors are removably attachable. However, the call processing server can associate a floating user agent with the communication from the external communication endpoint and lock the floating user agent to a gateway.