The purpose of this TS is to define a recommended set of supplementary services to the Teleservices and Bearer services which will be supported by a GSM PLMN in connection with other networks as a basis for the definition of the network capabilities required.
The descriptions of the different supplementary services are contained in the TS 02.8x series. Supplementary services not covered in TS 02.04
or the TS 02.8x series cannot be introduced unilaterally in any GSM PLMN if they require modification of the GSM signalling Specifications.
Technical realization of supplementary services is described in TS 03.11
and TS 04.10