3 Completion of Calls to Busy Subscriber
(CCBS)
3.1 Introduction
3.1.1 Scope
3.1.2 References
3.1.3 Terms and definitions
3.1.4 Abbreviations
3.2 Description
3.2.1 General description
3.2.2 Specific terminology
3.2.3 Qualification on the applicability to
telecommunication services
3.3 Operational requirements
3.3.1 Provision/withdrawal
3.3.2 Requirements on the originating network
3.3.3 Requirements on the terminating network
3.3.4 Requirements on the transit network
3.4 Coding
requirements
3.4.1 Introduction
3.4.2 Coding requirements
3.4.3 ASN.1 module
3.5 Signalling requirements
3.5.1 Activation/deactivation/registration
3.5.2 Erasure
3.5.3 Invocation and operation
3.5.4 Use of TC and SCCP
3.5.5 Dialogue
3.6 Interaction with other supplementary services
3.6.1 Call
Waiting (CW)
3.6.2 Call transfer services
3.6.3 Connected Line Identification
Presentation (COLP)
3.6.4 Connected Line Identification Restriction
(COLR)
3.6.5 Calling Line
Identification Presentation (CLIP)
3.6.6 Calling Line Identification Restriction
(CLIR)
3.6.7 Closed User Group (CUG)
3.6.8 Conference Calling (CONF)
3.6.9
Direct-Dialling-In (DDI)
3.6.10 Call diversion services
3.6.11 Line Hunting
3.6.12 Three-Party Service (3PTY)
3.6.13 User-to-User Signalling (UUS)
3.6.14 Multiple
Subscriber Number (MSN)
3.6.15 Call Hold (HOLD)
3.6.16 Advice of Charge (AOC)
3.6.17 Sub-addressing (SUB)
3.6.18 Terminal Portability (TP)
3.6.19
Completion of Calls to Busy Subscriber (CCBS)
3.6.20 Malicious Call Identification (MCID)
3.6.21 Reverse Charging (REV)
3.6.22 Multi-level precedence and preemption
(MLPP)
3.6.23 Private Numbering Plan (PNP)
3.6.24 International Telecommunication Charge
Card (ITCC)
3.6.25 Global Virtual Network Service (GVNS)
3.7 Interaction with other networks
3.7.1
Interworking with an ISUP network without an ISUP that fully supports
the CCBS capability
3.7.2 Interworking with a network without
CCBS-ASE capability
3.7.3 Interworking with a network without
SCCP/TC capability
3.7.4 Interworking with an intermediate network
without 1993 version of SCCP capability
3.7.5 Interworking with PSTN with analogue
subscribers using the CCBS service 26
3.7.6 Interworking with PSTN user
3.7.7 Procedures for interworking with private
ISDNs
3.8 Signalling flows
3.8.1 Normal call – B busy indication sent to
the calling user
3.8.2 Normal call – Successful CCBS request followed by a successful
CCBS call set-up
3.8.3 Unsuccessful CCBS request, terminal
activated
3.8.4 Unsuccessful CCBS request, network
destination
3.8.5 Successful CCBS request followed by an
unsuccessful CCBS call set-up
3.8.6 B idle at CCBS request from A
3.8.7 A busy when B becomes free
3.9 Parameter values
3.9.1 Timers in the originating local exchange
3.9.2 Timers in the destination local exchange
3.9.3 Interworking timers
3.10 Dynamic description