There are numerous industry standards@ technical reports@ and requirements documents addressing various aspects for Emergency Telecommunications Service (ETS) support in Next Generation Networks (NGNs). For an end-to-end National Security/Emergency Preparedness (NS/EP) priority communication session in an NGN@ priority mechanisms need to be supported over various interfaces and protocols and priority processing needs to be supported within functional elements spanning across various network domains (e.g.@ wireless access@ fixed access@ and core network segments)@ across network boundaries@ and within Internet Protocol (IP) transport networks. The deployment of NS/EP priority services (e.g.@ voice) requires applicability of the particular standard specification in context to the specific interface and protocol@ functional element@ network domains (e.g.@ wireless access@ fixed access@ and core network segments)@ for the support of NS/EP priority communications in the endto- end NGN infrastructure. This Technical Report (TR) 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 NS/EP priority related functions and capabilities supporting end-to-end priority communications in 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 ?C Telecommunications (ITU-T) specifications for the support of ETS. For example@ the ATIS standards further define the national specific aspects of the 3GPP protocols and capabilities supporting ETS. This TR includes a roadmap of the dependent 3GPP@ IETF@ and ITU-T specifications and standards. Purpose The purpose of this TR is to consolidate various ETS related specifications and provide a roadmap view to enable ETS deployment in NGNs. The objective is to provide a roadmap view showing the applicability of particular specifications to specific network layer@ network procedure@ interfaces or network element functional capabilities@ and segments making up the end-to-end NGN infrastructure.