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| Q.2957.1�:�Stage 3 description for additional information transfer supplementary services using B-ISDN digital subscriber signalling system No. 2 (DSS2) - Basic call : User-to-user signalling (UUS)
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Modified by ITU-T Q.2971 (10/1995).
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| In force components |
Number
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Title |
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Q.2957.1 (02/95)
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Stage 3 description for additional information transfer supplementary services using B-ISDN digital subscriber signalling system No. 2 (DSS2) - Basic call : User-to-user signalling (UUS)
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Modified by ITU-T Q.2971 (10/1995)
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In force
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Q.2957.1 (1995) Amendment 1 (12/99)
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In force
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