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ITU-T Q.955.1 (02/1992)

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Stage 3 description for community of interest supplementary services using DSS 1 : Closed user group
Citation: https://handle.itu.int/11.1002/1000/2352
Series title: Q series: Switching and signalling, and associated measurements and tests
  Q.850-Q.999: Digital subscriber Signalling System No. 1
  Q.950-Q.959: Stage 3 description for supplementary services using DSS1
Approval date: 1992-02-04
Approval process:TAP
Status: In force
Maintenance responsibility: ITU-T Study Group 11
Further details: Patent statement(s)