http://www.rfc-editor.org/rfc/rfc5516.txt
RFC 5516: Diameter Command Code Registration for the Third Generation Partnership Project (3GPP) Evolved Packet System (EPS), M. Jones, L. Morand2009-04-01T23:00:00-00:00This document registers a set of IANA Diameter Command Codes to be used in new vendor-specific Diameter applications defined for the Third Generation Partnership Project (3GPP) Evolved Packet System (EPS). These new Diameter applications are defined for Mobile Management Entity (MME)- and Serving GPRS (General Packet Radio Service) Support Node (SGSN)-related interfaces in the architecture for the Evolved 3GPP Packet Switched Domain, which is also known as the Evolved Packet System (EPS). This memo provides information for the Internet community.