22.0833GPPCall Waiting (CW) and Call Holding (HOLD)Stage 1Supplementary ServicesTS
The present document describes the Supplementary Services belonging to the group Call Completion Supplementary Services.
The general aspects, including definitions and recommended provision, of the description of Supplementary Services are given in specification TS 22.004 .
The group of Call Completion Supplementary Services is divided into the following two Supplementary Services:
– Call waiting (clause 1);
– Call hold (clause 2).
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.
 3GPP TR 21.905: "Vocabulary for 3GPP Specifications".
 3GPP TS 22.004: "General on Supplementary Services".
 3GPP TS 22.030: "Man‑Machine Interface (MMI) of the Mobile Station (MS)".
 3GPP TS 22.081: "Line identification Supplementary Services ‑ Stage 1".
 3GPP TS 22.084: "Digital cellular telecommunication system; MultiParty (MPTY) Supplementary Services ‑ Stage 1".
 3GPP TS 22.135: "Multicall Stage 1".
Abbreviations used in the present document are listed in TR 21.905 .