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BS 6789-7:1988 Apparatus with one or more particular functions for connection to public switched telephone networks run by certain public telecommunications operators. Specification for apparatus with call barring facilities
standard by BSI Group, 11/30/1988
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Full Description
Requirements for apparatus incorporating facilities for barring certain outgoing calls or classes of outgoing calls to a PSTN. To be read in conjunction with BS 6789-1Cross References:
BS 4778:Part 2
BS 6305
BS 6312
BS 6317
BS 6540:Part 4
BS 6789:Part 1
BS 6789:Section 3.1
BS 6789:Section 6.1
BT Specification D1804D
Telecommunications Act 1984