SSH EN 300 958 V7.0.1:2000

Digital cellular telecommunications system (Phase 2+) (GSM); Explicit Call Transfer (ECT) supplementary service; Stage 3 (GSM 04.91 version 7.0.1 Release 1998)

Scope

The present document gives the stage 3 description of the call transfer supplementary services. The present document specifies the procedures used at the radio interface (Reference point Um as defined in GSM04.02) for normal operation, registration, erasure, activation, deactivation, invocation and interrogation of call transfer supplementary services. Provision and withdrawal of supplementary services is an administrative matter between the mobile subscriber and the service provider and cause no signalling on the radio interface. In GSM04.10 the general aspects of the specification of supplementary services at the layer 3 radio interface are given. GSM04.80 specifies the formats and coding for the supplementary services. Definitions and descriptions of supplementary services are given in GSM 02.04, GSM 02.8x and GSM 02.9x-series. GSM02.91 is related specifically to call transfer supplementary services. The technical realization of supplementary services is described in GSM 03.11, GSM 03.8x and GSM 03.9x-series. GSM03.91 is related specifically to call transfer supplementary services.