A communications module for communicating between a computer network (1, 2, 3, 4) and a private branch exchange (5), where the communications module is arranged and adapted so as: a. to receive commands from the computer network (1, 2, 3, 4) (computer network commands 13)); b. if necessary to translate the computer network commands (13) into a form suitable for input into the private branch exchange (5) (private branch exchange commands (14)); and c. to send the private branch exchange commands (14) to the private branch exchange (5); to effect programming of the private branch exchange (5).