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ETSI TS 122 004
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ETSI TS 122 004 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); General on supplementary services (3GPP TS 22.004 version 14.0.0 Release 14)
standard by European Telecommunications Standards Institute, 03/01/2017
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Full Description
The purpose of ETSI TS 122 004 is to define a recommended set of supplementary services to the Teleservices andBearer services which will be supported by a PLMN in connection with other networks as a basis for the definition ofthe network capabilities required.Supplementary services not covered in 3GPP TS 22.004 cannot be introduced unilaterally in any PLMN if they requiremodification of the signalling Specifications.
Technical realization of supplementary services is described in 3GPP TS 23.011 [19] and 24.010 [21].