scope:

The scope of this standard is to identify and adapt as necessary 3GPP common IMS emergency procedures for applicability in North America to support emergency communications originating from an IMS subscriber (fixed, nomadic¹, or mobile) and delivered to an Emergency Services IP network (ESInet) or to a legacy Selective Router. ATIS-0700015.v002 specified procedures limited to voice and Global Text Telephony (GTT) [Ref 3] communication. ATIS-0700015.v003 expanded the procedures to incorporate additional multimedia including text, pictures, and video. This version (004) addresses issues associated with specific transfer models in an i3 ESInet.

While the main focus of this standard is IMS emergency service origination and in particular the associated impacts to an originating device and originating IMS network, the standard also covers related support from the access network and for location acquisition, subscriber home networks in the case of roaming, and considers support for service origination (e.g., call back) from a Public Safety Answering Point (PSAP).

This standard describes the IMS to ESInet interface, as well as the IMS to Selective Router interface. It identifies the types of media that can be delivered to each type of emergency services network.

With respect to 3GPP specifications, the scope of this standard is based upon capabilities defined in Release 12, except where explicitly noted otherwise. With respect to the NENA i3 standard [Ref 100], if there are any discrepancies between this standard and the NENA i3 standard concerning the definition of i3 architecture functional elements, interfaces, or procedures, the NENA i3 standard takes precedence.

Purpose

The purpose of this standard is to enable deployment in North America of support for Multimedia Emergency Services (MMES) calls² in the IP domain from originating networks that conform to 3GPP IMS specifications. The standard is intended to complement the NENA i3 standard [Ref 100] and to define any changes and limitations to the 3GPP IMS solution that are needed for operation in North America.

¹Additional detailed support for nomadic use cases is for further study.

² In this standard, the term "calls" is used to mean requests, including voice, texts, etc.