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ETSI TS 129 007
M00002875
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ETSI TS 129 007 Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); interworking between the Public Land Mobile Network (PLMN) Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN) (3GPP TS 29.007 version 14.0.0 Release 14)
standard by European Telecommunications Standards Institute, 04/01/2017
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ETSI TS 129 007 identifies the Mobile-services Switching Centre/Interworking Functions (MSC/IWFs) andrequirements to support interworking between: PLMN and PSTN; PLMN and ISDN;for circuit switched services in the PLMN. It is not possible to treat ISDN and PSTN as one type of network, even whenboth ISDN and PSTN subscribers are served by the same exchange because of the limitations of the PSTN subscribersaccess i.e. analogue connection without D-channel signalling.Within the present document, the requirements for voice and non-voice (data) calls are considered separately.