0 Scope

23.0833GPPCall Waiting (CW) and Call Hold (HOLD) supplementary servicesRelease 17Stage 2TS

The present document gives the stage 2 description of the call completion supplementary services.

The group of call completion supplementary services is divided into the following two supplementary services:

– Call waiting (CW) (clause 1);

– Call hold (HOLD) (clause 2).

0.1 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] 3GPP TR 21.905: "3G Vocabulary".

[2] 3GPP TS 22.082: "Call Forwarding (CF) Supplementary Services ‑ Stage 1".

[3] 3GPP TS 23.011: "Technical realization of supplementary services – General Aspects".

[4] 3GPP TS 24.008: "Mobile radio interface layer 3 specification; Core Network Protocols – Stage3".

[5] 3GPP TS 23.018: "Basic call handling".

[6] 3GPP TS 23.078: "Customized Applications for Mobile network Enhanced Logic (CAMEL) – Phase 3; Stage 2".

[7] 3GPP TS 23.135: "Multicall supplementary service; Technical Realisation; Stage 2".

[8] 3GPP TS 23.087: "User-to-User Signalling (UUS) – Stage 2".

[9] 3GPP TS 23.093: "Technical realisation of Completion of Calls to Busy Subscriber (CCBS) – Stage 2".

[10] 3GPP TS 23.072: "Call Deflection (CD) supplementary service – Stage2".

[11] 3GPP TS 29.007: "General requirements on interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN)".

0.2 Abbreviations

In addition to those below, abbreviations used in the present document are listed in 3GPP TR 21.905.

HTI: HoldTreatment Indicator