Content for  TS 23.091  Word version:  16.0.0

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1  ScopeWord‑p. 5
The present document gives the stage 2 description of the call transfer supplementary services.
Only one call transfer supplementary service has been defined, this is the Explicit Call Transfer (ECT) supplementary service, and is described in the present document.

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.
TR 21.905: "3G Vocabulary".
TS 23.083: "Call Waiting (CW) and Call Hold (HOLD) supplementary services - Stage 2".
TS 24.008: "Mobile Radio Interface Layer 3 specification; Core Network Protocols - Stage 3".
EN 300 368: "Integrated Services Digital network (ISDN); Explicit Call Transfer (ECT) supplementary service; Functional capabilities and information flows".
EN 300 356-14: "Integrated Services Digital network (ISDN); Signalling System No. 7; ISDN User Part (ISUP) version 3 for the international interface; Part 14: Explicit Call Transfer (ECT) supplementary service ".
TS 23.011: "Technical realization of Supplementary Services".
TS 23.018: "Basic Call Handling".

3  Definitions and abbreviations

3.1  Definitions

First call: One of the subscriber A calls (answered).
Notification Indicator (NI):
Indicates to each remote party in which state of the other remote party ECT was performed (active, alerting).
Redirection Number (Rdn):
Includes the presentation indicator and the directory number of the other remote party.
Second call:
The other subscriber A call (answered or alerting).
Subscriber A (PARTY A):
The served mobile subscriber - the one who has subscribed to, and invokes the ECT Supplementary Service.
Subscriber B (PARTY B):
The other party in the subscriber A first call.
Subscriber C (PARTY C):
The other party in the subscriber A second call.
Subscriber D (PARTY D):
The forwarded-to party when the call is forwarded by the subscriber C.
Transferred call:
The resulting call after successful explicit call transfer between B and C.

3.2  AbbreviationsWord‑p. 6
In addition to those below, abbreviations used in the present document are listed in TR 21.905.
Explicit Call Transfer supplementary service
Line Identity
Notification Indicator
Redirection number
Redirection number of party B
Redirection number of party D

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