NGN-GSI (studied by ITU-T in 2003 and named as NGN-GSI in 2005), focuses on developing the detailed standards necessary for NGN deployment to give service providers the means to offer the wide range of services expected in NGN. NGN-GSI harmonizes, in collaboration with other bodies, different approaches to NGN architecture worldwide (http://www.itu.int/ITU-T/ngn/).
By end 2006 ITU-T has published about 20 approved NGN recommendations.
It is important to note that 3GPP IMS, ETSI TISPAN and ITU-T NGN standards are not totally independent from each other. These standards are complementary and are based on many common concepts. Membership among the different organizations developing these standards often overlaps. The bodies working on them are addressing mobile, fixed and converged networks and have regional, national and global views.
Source: ITU
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