The objective of this Recommendation is to identify impacts on networks which are connected to the IPv6-based NGN@ and to describe the relevant scenarios/models in order to identify the functional requirements. NGN transport stratum functions provide a series of transport and transport control functions that support the service stratum features. In IPv6@ some mechanisms have been already introduced to support both transport and transport control functions in order to perform the access to the IPv6- based NGN. Along with IPv6@ the devices in network also have relevant functional requirements. This Recommendation covers: ?C identification of the impact on networks which are connected to IPv6-based NGNs; ?C network access scenarios specific to the NGN@ including parameter configurations such as prefix@ address and server configurations; ?C scenarios of access network level registration in IPv6-based NGNs; ?C functional requirements for networks which are connected to IPv6-based NGNs.