< draft-schulzrinne-ecrit-psap-callback-02.txt		draft-schulzrinne-ecrit-psap-callback-03.txt >
	ECRIT H. Schulzrinne		ECRIT H. Schulzrinne
	Internet-Draft Columbia University		Internet-Draft Columbia University
	Intended status: Informational H. Tschofenig		Intended status: Informational H. Tschofenig
	Expires: September 9, 2010 Nokia Siemens Networks		Expires: September 9, 2010 Nokia Siemens Networks
	M. Patel		M. Patel
	Nortel		InterDigital Communications
	March 8, 2010		March 8, 2010
	Public Safety Answering Point (PSAP) Callbacks		Public Safety Answering Point (PSAP) Callbacks
	draft-schulzrinne-ecrit-psap-callback-02.txt		draft-schulzrinne-ecrit-psap-callback-03.txt
	Abstract		Abstract
	After an emergency call is completed (either prematurely terminated		After an emergency call is completed (either prematurely terminated
	by the emergency caller or normally by the call-taker) it is possible		by the emergency caller or normally by the call-taker) it is possible
	that the call-taker feels the need for further communication or for a		that the call-taker feels the need for further communication or for a
	clarification. For example, the call may have been dropped by		clarification. For example, the call may have been dropped by
	accident without the call-taker having sufficient information about		accident without the call-taker having sufficient information about
	the current situation of a wounded person. A call-taker may trigger		the current situation of a wounded person. A call-taker may trigger
	a callback towards the emergency caller using the contact information		a callback towards the emergency caller using the contact information
	skipping to change at page 3, line 7 ¶		skipping to change at page 3, line 7 ¶
	(http://trustee.ietf.org/license-info) in effect on the date of		(http://trustee.ietf.org/license-info) in effect on the date of
	publication of this document. Please review these documents		publication of this document. Please review these documents
	carefully, as they describe your rights and restrictions with respect		carefully, as they describe your rights and restrictions with respect
	to this document. Code Components extracted from this document must		to this document. Code Components extracted from this document must
	include Simplified BSD License text as described in Section 4.e of		include Simplified BSD License text as described in Section 4.e of
	the Trust Legal Provisions and are provided without warranty as		the Trust Legal Provisions and are provided without warranty as
	described in the BSD License.		described in the BSD License.
	Table of Contents		Table of Contents
	1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4		1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
	1.1. Routing Asymmetry . . . . . . . . . . . . . . . . . . . . 4		1.1. Routing Asymmetry . . . . . . . . . . . . . . . . . . . . 3
	1.2. Multi-Stage Resolution . . . . . . . . . . . . . . . . . . 5		1.2. Multi-Stage Resolution . . . . . . . . . . . . . . . . . . 4
	1.3. Call Forwarding . . . . . . . . . . . . . . . . . . . . . 6		1.3. Call Forwarding . . . . . . . . . . . . . . . . . . . . . 5
	1.4. PSTN Interworking . . . . . . . . . . . . . . . . . . . . 8		1.4. PSTN Interworking . . . . . . . . . . . . . . . . . . . . 7
	1.5. Network-based Service URN Resolution . . . . . . . . . . . 8		1.5. Network-based Service URN Resolution . . . . . . . . . . . 7
	2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 10		2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 9
	3. Design Approaches . . . . . . . . . . . . . . . . . . . . . . 11		3. Design Approaches . . . . . . . . . . . . . . . . . . . . . . 10
	4. Topics for Investigation . . . . . . . . . . . . . . . . . . . 14		4. Topics for Investigation . . . . . . . . . . . . . . . . . . . 13
	5. Security Considerations . . . . . . . . . . . . . . . . . . . 15		5. Security Considerations . . . . . . . . . . . . . . . . . . . 14
	6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 16		6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 15
	7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 17		7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 16
	7.1. Informative References . . . . . . . . . . . . . . . . . . 17		7.1. Informative References . . . . . . . . . . . . . . . . . . 16
	7.2. Informative References . . . . . . . . . . . . . . . . . . 17		7.2. Informative References . . . . . . . . . . . . . . . . . . 16
	Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 19		Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 18
	1. Introduction		1. Introduction
	Summoning police, the fire department or an ambulance in emergencies		Summoning police, the fire department or an ambulance in emergencies
	is one of the fundamental and most-valued functions of the telephone.		is one of the fundamental and most-valued functions of the telephone.
	As telephone functionality moves from circuit-switched telephony to		As telephone functionality moves from circuit-switched telephony to
	Internet telephony, its users rightfully expect that this core		Internet telephony, its users rightfully expect that this core
	functionality will continue to work at least as well as it has for		functionality will continue to work at least as well as it has for
	the legacy technology. New devices and services are being made		the legacy technology. New devices and services are being made
	available that could be used to make a request for help, which are		available that could be used to make a request for help, which are
	skipping to change at page 19, line 29 ¶		skipping to change at page 19, line 29 ¶
	Nokia Siemens Networks		Nokia Siemens Networks
	Linnoitustie 6		Linnoitustie 6
	Espoo 02600		Espoo 02600
	Finland		Finland
	Phone: +358 (50) 4871445		Phone: +358 (50) 4871445
	Email: Hannes.Tschofenig@gmx.net		Email: Hannes.Tschofenig@gmx.net
	URI: http://www.tschofenig.priv.at		URI: http://www.tschofenig.priv.at
	Milan Patel		Milan Patel
	Nortel		InterDigital Communications
	Maidenhead Office Park, Westacott Way
	Maidenhead SL6 3QH
	UK
	Email: milanpa@nortel.com		Email: Milan.Patel@interdigital.com
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