ETSI - TS 100 921
Digital Cellular Telecommunications System (Phase 2+); Service Accessibility
|Publication Date:||1 July 1998|
The technical realization of service accessibility in terms of registration, handover, roaming and system selection is defined in the 03 series of GSM specifications. The purpose of this TS is to describe the service access procedures as presented to the user.
Definitions and procedures are provided in this TS for international roaming, national roaming and regionally provided service. These are mandatory in relation to the technical realization of the Mobile Station (MS).