[Ecrit] I-D Action: draft-ietf-ecrit-psap-callback-11.txt
internet-drafts@ietf.org Thu, 26 September 2013 13:29 UTC
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Subject: [Ecrit] I-D Action: draft-ietf-ecrit-psap-callback-11.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Emergency Context Resolution with Internet Technologies Working Group of the IETF. Title : Public Safety Answering Point (PSAP) Callback Author(s) : Henning Schulzrinne Hannes Tschofenig Christer Holmberg Milan Patel Filename : draft-ietf-ecrit-psap-callback-11.txt Pages : 14 Date : 2013-09-26 Abstract: 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. A solution based on a new header field value, called "psap-callback", for the SIP Priority header field is specified to accomplish the PSAP callback marking. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-ecrit-psap-callback There's also a htmlized version available at: http://tools.ietf.org/html/draft-ietf-ecrit-psap-callback-11 A diff from the previous version is available at: http://www.ietf.org/rfcdiff?url2=draft-ietf-ecrit-psap-callback-11 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/
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