Public Safety Answering Point (PSAP) Callback

The information below is for an old version of the document
Document Type Expired Internet-Draft (ecrit WG)
Last updated 2012-09-12 (latest revision 2012-03-11)
Replaces draft-schulzrinne-ecrit-psap-callback
Stream IETF
Intended RFC status (None)
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state WG Document
Document shepherd None
IESG IESG state Expired
Consensus Boilerplate Unknown
Telechat date
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


After an emergency call is completed (either prematurely terminated by the emergency caller or normally by the call taker) it is possible that the call taker feels the need for further communication. For example, the call may have been dropped by accident without the call taker having sufficient information about the current situation of a wounded person. A call taker may trigger a callback towards the emergency caller using the contact information provided with the initial emergency call. This callback could, under certain circumstances, be treated like any other call and as a consequence it may get blocked by authorization policies or may get forwarded to an answering machine. The IETF emergency services architecture specification already offers a solution approach for allowing PSAP callbacks to bypass authorization policies to reach the caller without unnecessary delays. Unfortunately, the specified mechanism only supports limited scenarios. This document discusses shortcomings of the current mechanisms and illustrates additional scenarios where better-than- normal call treatment behavior would be desirable. Note that this version of the document does not yet specify a solution due to the lack of the working group participants agreeing on the requirements.


Henning Schulzrinne (
Hannes Tschofenig (
Christer Holmberg (
Milan Patel (

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