This Recommendation identifies service requirements and functional framework for the support of VPN services in NGN, including the mobile environment.

The provision of VPN services in NGN, including the mobile environment, covers the support of mobility management functions across different fixed and wireless network domains as well as at different network levels including intra-access network, inter-access network, and inter-network levels [ITU-T Q.1706]. This includes mobility support at the NGN service stratum and the NGN transport stratum [b-ITU-T Y.2011].

The detailed definition of mobility management-related functions and architecture is outside the scope of this Recommendation.