ForewordIntroduction1 Scope2 References3 Definitions and abbreviations4 Capabilities for the support of IP multimedia services5 PSTN/ISDN emulation service6 Codecs services7 Network attachment requirements8 CPE configuration9 Control of processing overload10 IP addressing11 NGN interconnection12 Transport stratum 5 PSTN/ISDN emulation service 22.5193GPPBusiness communication requirementsTS Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM Not in the scope of the present document.