The Telecommunication and Internet Converged Services and Protocols for Advanced Networking (TISPAN) is a standardization group established in 2003 by the European Telecommunications Standards Institute (ETSI) to address the topic of fixed networks and Internet convergence, their services and protocols
. The TISPAN working group is composed of the TIPHON (Telecommunications and Internet Protocol Harmonization Over Networks) and SPAN (Services and Protocols for Advanced Networks) working groups and looks at the development of Next Generation Networks (NGN) from a European perspective, but also has many participants from outside Europe. The NGN architecture model
proposed by TISPAN consists of cooperating subsystems that share certain network components. This sub-system architecture can be extended by further sub-systems and thus be adapted to the needs and to new services. Themodel is described in ITU Recommendation
Y.2011 The NGN architecture ensures that the network resources, services and user equipment are the same for all applications and takes into account both fixed and mobile applications. A crucial subsystem is based on the IP Multimedia Subsystem (IMS) from the 3rd Generation Partnership Project (3GPP).