Next-Generation Vehicle-Initiated Emergency Calls

The information below is for an old version of the document
Document Type None Internet-Draft (ecrit WG)
Last updated 2016-10-09
Replaces draft-gellens-ecrit-car-crash
Stream IETF
Intended RFC status (None)
Expired & archived
pdf htmlized bibtex
Additional URLs
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Stream WG state (None)
Document shepherd Allison Mankin
IESG IESG state Unknown state
Consensus Boilerplate Unknown
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Send notices to "Allison Mankin" <>

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document describes how to use IP-based emergency services mechanisms to support the next generation of emergency calls placed by vehicles (automatically in the event of a crash or serious incident, or manually invoked by a vehicle occupant) and conveying vehicle, sensor, and location data related to the crash or incident. Such calls are often referred to as "Automatic Crash Notification" (ACN), or "Advanced Automatic Crash Notification" (AACN), even in the case of manual trigger. The "Advanced" qualifier refers to the ability to carry a richer set of data. This document also registers a MIME Content Type and Emergency Call Additional Data Block for the vehicle, sensor, and location data (often referred to as "crash data" even though there is not necessarily a crash). An external specification for the data format, contents, and structure are referenced in this document. This document reuses the technical aspects of next-generation pan- European eCall (a mandated and standardized system for emergency calls by in-vehicle systems within Europe and other regions). However, this document specifies a different set of vehicle (crash) data, specifically, the Vehicle Emergency Data Set (VEDS) rather than the eCall Minimum Set of Data (MSD). This document is an extension of the eCall document, with the primary differences being that this document makes the MSD data set optional and VEDS mandatory, and adds attribute values to the eCall metadata/control object to permit greater functionality. This document registers a new INFO package (identical to that registered for eCall but with the addition of the VEDS MIME type). This document also describes legacy (circuit- switched) ACN systems and their migration to next-generation emergency calling, to provide background information and context.


Randall Gellens (
Brian Rosen (
Hannes Tschofenig (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)