scope:

This Technical Report provides guidelines for the application of existing1 Differentiated Service (DiffServ) Per Hop Behaviors (PHB) and their associated DiffServ Code Points (DSCP) when Emergency Telecommunications Service (ETS) Voice over IP (VoIP) packets are transported in the media stream at Network-Network Interfaces (NNI). These guidelines are intended to facilitate the formulation of interconnection agreements between public domain service carriers by providing guidance with respect to the per hop queuing treatment to be provided for ETS calls, thereby allowing for satisfactory end-to-end transport of ETS calls over multiple IP-based networks. These guidelines are intended for use until an acceptable future solution is standardized and available for implementation