25 Identification of Online Charging System

24 Numbering, addressing and identification for Proximity-based Services (ProSe)

26 Numbering, addressing and identification for Mission Critical Services

23 Numbering, addressing and identification for the OAM System

22 Addressing and identification for ANDSF

20 Addressing and Identification for IMS Centralized Services

21 Addressing and Identification for Dual Stack Mobile IPv6 (DSMIPv6)

17 Numbering, addressing and identification within the Generic Access Network

19 Numbering, addressing and identification for the Evolved Packet Core (EPC)

18 Addressing and Identification for IMS Service Continuity and Single-Radio Voice Call Continuity