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

3GPP‑Page   ETSI‑search   full‑ToC    
(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
See also:
CCBS-related TS/TR
TS 22.093  its descendant

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.