04.853GPPClosed User Group (CUG) supplementary servicesStage 3TS
This Technical Specification (TS) has been produced by the Special Mobile Group (SMG).
The present document specifies the procedures used at the radio interface (reference point Um as defined in GSM 04.02) for normal operation, registration, erasure, activation, deactivation, invocation and interrogation of Closed User Group (CUG) supplementary services within the digital cellular telecommunications system.
The contents of the present document is subject to continuing work within SMG and may change following formal SMG approval. Should SMG modify the contents of the present document it will be re-released with an identifying change of release date and an increase in version number as follows:
7 indicates Release 1998 of GSM Phase 2+
x the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc.
y the third digit is incremented when editorial only changes have been incorporated in the specification.
The specification from which the present document has been derived was originally based on CEPT documentation, hence the presentation of the present document may not be entirely in accordance with the ETSI/PNE rules.