Abstract: A satellite cellular communication system includes terrestrial user terminals and gateways, which are interconnected, at least in part, by communications over antenna spot beams produced by the satellite. Various control signals and information signals traverse the system. The processing is simplified at the terrestrial terminals by adding dummy bits to the call maintenance signals, and processing them to equal the frame size of the traffic signals, and by encoding the call maintenance signals using the same algorithm as that used to encode the traffic signals. The call traffic signals are separated from the call maintenance signals, after decoding the frames in a common manner, by (a) identifying as traffic signals those frames in which error detection and correction (EDAC) identifies no error, and in which the 27 bits added to the call maintenance signals do not match the added-bit pattern.