Committed to connecting the world

  •  
wtisd

ITU-T Recommendations

Search by number:
Others:
Skip Navigation Links
Content search
Advanced search
Provisional name
Equivalent number
Formal description
Study Groups tree viewExpand Study Groups tree view

ITU-T Q.953.5 (12/1999)

عربي | 中文 | English | Español | Français | Русский
Stage 3 description for call completion supplementary services using DSS 1 : Call Completion on No Reply (CCNR)
This Recommendation specifies the stage three of the Call Completion on No Reply (CCNR) supplementary service for the Integrated Services Digital Network (ISDN) at the T reference point or the coincident S and T reference point by means of the Digital Subscriber System No. 1 (DSS1) protocol. Stage three identifies the protocol procedures and switching functions needed to support a telecommunication service.The CCNR supplementary service enables a calling user A, encountering a destination B which does not answer the call (No Reply), to be notified, when the destination B becomes not busy after having initiated an activity. If user A desires, then the network will reinitiate the call to the specified destination B.This Recommendation includes an electronic attachment containing the SDL diagrams in reprocessable SDT format.
Citation: https://handle.itu.int/11.1002/1000/4795
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: 1999-12-03
Approval process:TAP
Status: In force
Observation:This Recommendation includes 1 diskette containing the SDL process diagrams of DSS1 CCNR in machine processable form
Maintenance responsibility: ITU-T Study Group 11
Further details: Patent statement(s)