The pixels of an image sensor array can be readout in mn blocks that are compatible with the operation of a desired image compression algorithm, thereby reducing the amount of memory required by the image compression algorithm. A producer who utilizes one or more separate manufacturers, operates a remote module that communicates over forward and backward channels with a local module at the manufacturer. The Simulated Facility Group System calculates the IP Centrex Access Facility bandwidth requirement of each IP Centrex call set up request, based on a Call Type Parameter received from the Centrex Feature Gateway. Another embodiment relates to an apparatus for automated correction of duplex mismatches.