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TS 02.93 (SA1)
CCBS – Completion of Calls to Busy Subscriber Service description Stage 1

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(P) GSM Rel-98 v7.0.0    1999/06    22 p.
(P) GSM Rel-97 v6.0.1    1998/04    19 p.

Rapporteur:  SCARRONE, Enrico
Descendant:  TS 22.093    
See also:  CCBS-related TS/TR    

This TS specifies the stage 1 description of Completion of Calls to Busy Subscriber (CCBS) from the subscriber's and user's points of view.

Here is a short description of the CCBS service:
  • When subscriber A encounters a Network Determined User Busy (NDUB) destination B, subscriber A can request the CCBS supplementary service (i.e. activate a CCBS Request against destination B). The network will then monitor the wanted destination B for becoming idle.
  • When the wanted destination B becomes idle, then the network will wait a short time in order to allow destination B to make an outgoing call. If destination B does not make any outgoing call within this time, then the network shall automatically recall subscriber A.
  • When subscriber A accepts the CCBS recall, within a defined time, then the network will automatically generate a CCBS call to destination B.
  • CCBS has to be supported by the originating, as well as by the terminating network.


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1   Scope   PDF-p. 6
2   References
3   Definitions and abbreviations   PDF-p. 7
4   Description
5   Normal procedures with successful outcome   PDF-p. 9
6   Exceptional procedures or unsuccessful outcome
7   Interaction with other supplementary services
8   Mobility aspects      Up
A   Cross Phase compatibility   PDF-p. 19
B  (Normative)   Roaming to non-supporting networks   PDF-p. 20
C   Change Request History   PDF-p. 21      Up

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