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Other IP Networks AS P - Mw Mw Mw/Mk/Mm Mr Mi Mp Mn Gq Dx Sh Rf/Ro PSTN/ISDN Ie Mi Other IP networks UE Mg Mj Gm ISC Cx Dh Ic Rr/Ro Cx Ib Ia Id PSTN If MGCF I-CSCF BGCF HSS S-CSCF MRFC Mw SLF Charging Function SGF SGW IWF I-BGF RACS AS IBCF SEG NASS IMS functions ETSI TISPAN extensions IP transport (access and core) P-CSCF ETSI TISPAN NGN Functional Architecture and Peering Elements SF MF + RF SF MF + RF OF Functions not shown |