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A draft amendment to BS 6789-7:1988 "Apparatus with one or more particular functions for connection to public switched telephone networks run by certain public telecommunications operators. Part 7. Specification for apparatus with call barring facilities"
BS PD 6566 – A draft amendment to BS 6789-7:1988 "Apparatus with one or more particular functions for connection to public switched telephone networks run by certain public telecommunications operators. Part 7. Specification for apparatus with call barring facilities"
