Sistemi i telekomunikacionit dixhital celular (Faza 2+) (GSM); Sistemi Universal i Telekomunikacionit Mobile (UMTS); LTE; 5G; Ndërveprimi midis nënsistemit Multimedia IP (IM) të Rrjeti Kryesor (CN) dhe rrjeteve me Qark të Mbyllur (CS) (3GPP TS 29.163 versioni 16.4.0 Publikimi 16)
Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; 5G; Interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networks (3GPP TS 29.163 version 16.4.0 Release 16)