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TS 24.072
Call Deflection (CD)
Supplementary Service

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Rapporteur:
Mr. Wiehe, UlrichNokia Solutions & Networks (S)

Content for  TS 24.072  Word version:  16.0.0

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1  ScopeWord‑p. 5
This Global System for Mobile communications Technical Specification specifies the procedures used at the radio interface (reference point Um as defined in TS 24.002) for normal operation of Call Deflection (CD) supplementary service. Provision and withdrawal of supplementary services is an administrative matter between the mobile subscriber and the service provider and cause no signalling on the radio interface.

2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 22.072: "Call Deflection (CD) supplementary service Stage 1".
[3]
TS 24.002: "GSM Public Land Mobile Network (PLMN) access reference configuration".
[4]
TS 24.008: "Mobile radio interface Layer 3 specification; Core network protocols; Stage 3".
[5]
TS 24.080: "Mobile radio interface layer 3 supplementary services specification; Formats and coding".
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3  Definitions and abbreviations

3.1  Abbreviations

Abbreviations used in this specification are listed in TR 21.905.

4  Call Deflection (CD)Word‑p. 6

4.1  Normal operation

4.1.1  Served mobile subscriber side

The served mobile subscriber may invoke the call deflection supplementary service if an incoming call is offered. According to TS 22.072 this may happen as an automatic response from the mobile station if the call is offered or as the result of a subscriber action.
The mobile station shall invoke the call deflection supplementary service by initiating call clearing with a DISCONNECT message including the call deflection request (refer to Figure 4.1). The call deflection request shall contain the DeflectedToNumber which may be accompanied by a DeflectedToSubAddress.
The MS may invoke the call deflection supplementary service at every time after call confirmation until the call is accepted (refer to TS 24.008). If the network accepts the call deflection request, it shall continue call clearing. The result indication shall be returned to the mobile station in the RELEASE message.
If the network cannot accept the call deflection request, it shall continue call clearing. The corresponding error indication shall be returned to the mobile station in the RELEASE message. Error values are specified in TS 24.080.
During the call deflection request the MS shall run a timer TCD. This timer is started when the call deflection request is sent and stopped when a response is received from the network. If this timer expires the MS shall assume that the call deflection request has failed, locally release the invokeID, inform the user of the failure and continue call clearing as defined in TS 24.008.
(not reproduced yet)
Figure 4.1: Call deflection invocation for an incoming call
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4.1.2  Deflected-to mobile subscriber sideWord‑p. 7
As for the call forwarding supplementary services the deflected-to mobile subscriber will receive a NotifySS operation containing the SS Notification indicating that the incoming call is a forwarded call. When available, the SS Code of the Call Deflection supplementary service is included, see Figure 4.2.
When multiple diversions occurs the value of the SS Code shall relate to the last invoked diversion service.
In addition the deflected-to subscriber will receive the redirecting party BCD number and optionally, a redirecting party subaddress.
The redirecting party BCD number information element is made up of a number of information units as defined in TS 24.008.
In addition to or instead of the redirecting party's digits, the subscriber may be given the following information:
  • screening indicator;
  • presentation indicator.
Indicator values are given in TS 24.008.
The redirecting party subaddress information element is made up of a number of information units as defined in TS 24.008.
(not reproduced yet)
Figure 4.2: Notification to the forwarded to mobile subscriber that the incoming call is a forwarded call
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4.1.3  Calling mobile subscriber side

As a subscription option, the served mobile subscriber can request that the calling mobile subscriber receives a NotifySS operation containing the SS Notification indicating that the call has been deflected. When available, the SS Code of the call deflection supplementary service is included, see Figure 4.3.
(not reproduced yet)
Figure 4.3: Notification to the calling mobile subscriber that the call is forwarded
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$  Change historyWord‑p. 8

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