---

• ITU-T Rec. Q.730 (1988)
• 1 General
  • 1.2 Information request/response
  • 1.3 Exceeding the maximum message length (e.g. ISDN User Part 272 octets)
  • 1.4 Layout of Recommendation Q.730
• 2 User-to-user signalling service
  • 2.1 General description of user-to-user service
  • 2.2 Procedures for user-to-user signalling associated with circuit-switched call
• 3 Closed user group (CUG)
  • 3.1 General
  • 3.2 Call set-up procedure with decentralized administration of CUG data
  • 3.3 Call set-up procedure with centralized administration of CUG data
  • 3.4 ASE for CUG service with centralized administration of CUG data
• 4 General description of theCalling Line Identity Presentation and Restriction service
  • 4.1 Description of the Calling Line Identity Presentation (CLIP) service
  • 4.2 Description of the Calling Line Identity Restriction (CLIR) service
  • 4.3 Nodal signalling function SDLs for CLIP and CLIR
  • 4.4 Interaction of CLIP with other supplementary services
  • 4.5 Interaction of CLIR with other supplementary services
• 5 Direct Dialling In (DDI)
  • 5.1 Definitions
  • 5.2 Procedures
  • 5.3 Interactions with sub-addressing
• 6 Call Forwarding services
  • 6.1 General description of Call Forwarding services
  • 6.2 Definition of Call Forwarding services
  • 6.3 Procedures for Call Forwarding
  • 6.4 Interactions with other Supplementary Services where interaction has ISDN User Part impact
  • 6.5 Message flow diagrams
• 7 Time-out table
• ANNEX A – Signalling procedure for the explicit invocation of user-to-user signalling services 1, 2 and 3
• A.1 User-to-user signalling service
• A.2 Procedures for user-to-user signalling associated with circuit switched calls