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Specifies the signalling protocol for the support of do not disturb and do not disturb override supplementary services at the Q reference point between private integrated service network exchanges connected together within a private integrated services network. The Q reference point is defined in AS/NZS 4136.1:1995. It is one of a series of Standards applicable to private integrated services networking. This Standard is identical with and has been reproduced from ISO/IEC 14844:1996.