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ITU-T Q.957

1993 Edition, January 1, 1993

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Stage 3 Description for Additional Information Information Transfer Supplementary Services Using DSS 1 Clause 1 - User-to-User Signalling (UUS) - Digital Subscriber Signalling System No. 1 - Stage 3 Description for Supp. Services Using DSS 1 (Study Group XI) 23 pp



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