This Technical Report provides a roadmap view of the subtending suite of ATIS standards, technical reports, and requirements documents showing the applicability of particular standard specifications in the context of enabling deployment of the needed National Security/Emergency Preparedness (NS/EP) priority related functions and capabilities supporting end-to-end priority communications in Next Generation Networks (NGNs). The ATIS set of standards includes national specific applications of 3rd Generation Partnership Project (3GPP), Internet Engineering Task Force (IETF), and International Telecommunications Union - Telecommunications (ITU-T) specifications for the support of ETS. This document includes a roadmap of the dependent 3GPP, IETF, and ITU-T specifications and standards.