IMS architecture was designed specifically for mobile access. Taking as its starting point a 3GPP IMS architecture, the European Telecommunication Standards Institute (ETSI) decided to establish a specific standardization group named TISPAN (Telecom and Internet Services and Protocols for Advanced Networks) to develop a NGN architectural framework larger in scope than IMS.
Through TISPAN, ETSI set about the task of delivering a NGN specification adapted for DSL access by defining the IP connectivity features of the network that were in common with GPRS. In late 2005, it released an IMS-based architectural framework that was adapted for fixed DSL broadband access (Release 1) (see Box 3.10). The TISPAN architecture (www.etsi.org/tispan/ ) also extends the IMS by introducing an emulation subsystem for PSTN/ISDN.
Both 3GPP and ETSI are further developing their IMS based work. In 2005, 3GPP introduced a Release 6 and is currently working on Release 7. TISPAN is now working on Re-lease 2, with a focus on enhanced mobility, new services and content delivery with improved security and network management. Eventually, ETSI envisions a common IMS-based core architectural framework for all kinds of fixed and wireless broadband access.
Source: ITU, ETSI
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