http://www.rfc-editor.org/rfc/rfc4542.txt
RFC 4542: Implementing an Emergency Telecommunications Service (ETS) for Real-Time Services in the Internet Protocol Suite, F. Baker, J. Polk2006-05-01T23:00:00-00:00This document primarily discusses supporting ETS in the context of the US Government and NATO, because it focuses on the Multi-Level Precedence and Preemption (MLPP) and Government Emergency Telecommunication Service (GETS) standards. The architectures described here are applicable beyond these organizations. This memo provides information for the Internet community.