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ITU-T Q.954

1993 Edition, March 1993

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DIGITAL SUBSCRIBER SIGNALLING SYSTEM NO. 1 - STAGE 3 DESCRIPTION FOR SUPPLEMENTARY SERVICES USING DSS 1 - CLAUSE 1: CONFERENCE CALLING - CLAUSE 2: THREE-PARTY SERVICE



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Superseded By: ITU-T Q.954.1

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WITHDRAWN S/S BY ITU-T Q.954.1 AND ITU-T Q.954.2
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