Digital Cellular Telecommunications System (Phase 2+); Mobile Radio Interface Layer 3 Supplementary Services Specification; Formats and Coding (GSM 04.80 Version 7.1.0 Release 1998)
The present document contains the coding of information necessary for support of supplementary service operation on the mobile radio interface layer 3. Clause 2 gives the functional definitions and contents of messages for call independent supplementary service operations. Messages necessary for support of call related supplementary service operations are defined in GSM 04.08. Clause 3 gives the general format and coding for messages used for call independent supplementary service and the format and coding of information elements used for both call related and call independent supplementary service operations. Clause 4 gives the specification of the call related and call independent supplementary service operations.