If one or more MPUs are configured as the local domain forwarding server(s) in the local domain, the local domain forwarding server can connect to a maximum of 5000 cameras and forward a maximum of 384 (VCN3010) or 768 (VCN3020) channels of media streams. The differences between a pure-forwarding MPU and a video and image storage MPU are as follows: The camera access capability of a pure-forwarding MPU is improved significantly and a pure-forwarding MPU does not store recordings or images.