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ITU-T Q.731.1 1996 Edition, July 1, 1996
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Stage 3 Description for Numbering Identification Supplementary Services Using SS No. 7: Direct-Dialling-in (DDI) - Series Q: Switching and Signalling; Specifications of Signalling System No. 7 - ISDN Supplementary Services
Additional Comments: INCLUDES SECTION 8
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