One document matched: draft-polk-ecrit-local-emergency-rph-namespace-01.txt
Differences from draft-polk-ecrit-local-emergency-rph-namespace-00.txt
ECRIT Working Group James Polk
Internet-Draft Cisco Systems
Expires: January 25th, 2008 July 25th, 2007
Intended Status: Standards Track (as PS)
IANA Registering a SIP Resource Priority Header
Namespace for Local Emergency Communications
draft-polk-ecrit-local-emergency-rph-namespace-01
Status of this Memo
By submitting this Internet-Draft, each author represents that any
applicable patent or other IPR claims of which he or she is aware
have been or will be disclosed, and any of which he or she becomes
aware will be disclosed, in accordance with Section 6 of BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet-
Drafts.
Internet-Drafts are draft documents valid for a maximum of six
months and may be updated, replaced, or obsoleted by other documents
at any time. It is inappropriate to use Internet-Drafts as
reference material or to cite them other than as "work in
progress."
The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt.
The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html.
This Internet-Draft will expire on January 25th, 2008.
Copyright Notice
Copyright (C) The IETF Trust (2007).
Abstract
This document creates and IANA registers the new Session Initiation
Protocol (SIP) Resource Priority header (RPH) namespace "sos" for
local emergency usage to a public safety answering point (PSAP),
between PSAPs, and between a PSAP and first responders and their
organizations.
Polk Expires January 2008 [Page 1]
Internet-Draft SIP RPH Namespace for Local Emergencies July 2007
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL
NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described
in [RFC2119].
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Rules of Usage of the Resource Priority Header . . . . . . . 3
3. "SOS" Namespace Definition . . . . . . . . . . . . . . . . . 3
3.1 Namespace Definition Rules and Guidelines . . . . . . . . 4
3.2 The "sos" Namespace . . . . . . . . . . . . . . . . . . . 4
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
4.1 IANA Resource-Priority Namespace Registration . . . . . . 4
4.2 IANA Priority-Value Registrations . . . . . . . . . . . . 5
5. Security Considerations . . . . . . . . . . . . . . . . . . . 5
6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 5
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 5
7.1 Normative References . . . . . . . . . . . . . . . . . . 5
7.2 Informative References . . . . . . . . . . . . . . . . . 5
Author's Address . . . . . . . . . . . . . . . . . . . . . . 6
Intellectual Property and Copyright Statements . . . . . . . 6
1. Introduction
This document creates and IANA registers the new Session Initiation
Protocol (SIP) Resource Priority header (RPH) namespace "sos" for
local emergency usage. The SIP Resource-Priority header is defined
in RFC 4412 [RFC4412]. This new namespace can be from a caller in
distress, or added at the entry server into a emergency services
managed network. This new namespace can be used between PSAPs, and
between a PSAP and first responders and their organizations.
Within controlled environments, such as an IMS infrastructure or
Emergency Services network (ESInet), where misuse can be reduced to
a minimum where possible, providing an explicit priority indication
facilitates treatment of emergency SIP messages according to local
policy.
Usage of the "sos" namespace is to be defined in a future
document(s). This document merely creates the namespace, per the
rules within [RFC4412] necessitating of a Standards Track RFC for
IANA registering new RPH namespaces and their relative
priority-value order. [RFC4412] further states that modifying the
order or the number of priority-values to a registered namespace
SHOULD NOT occur, due to interoperability issues with dissimilar
implementations.
From this fact about RFC 4412, and the possibility that within
emergency services networks, a Multilevel Precedence and Preemption
Polk Expires January 2008 [Page 2]
Internet-Draft SIP RPH Namespace for Local Emergencies July 2007
(MLPP)-like behavior can be desired - ensuring more important calls
are established or retained, the "sos" namespace is given 5
priority-levels. MLPP-like SIP signaling is not defined in this
document for 911/112/999 style emergency calling, but it is not
prevented either.
2. Rules of Usage of the Resource Priority Header
This document does not extent the usage or treatment options of
[RFC4412] at this time. However, usage of this namespace does not
have a normal, or routine call level. In other words, there is not
a "namespace.0" like namespace.priority-value that
joe_public@example.com is going to use in SIP messages when
communicating to a destination other than a PSAP or equivalent.
Every use of this namespace will be in times of an emergency, where
at least one end of the communication is with a local emergency
organization.
The "sos" namespace has 5 priority-values, in a specified relative
priority order, and is a queue-based treatment namespace [RFC4412].
Individual jurisdictions MAY configure their SIP entities for
preemption treatment, but this is optional, and a local policy
decision.
3. "SOS" Namespace Definition
One thing to keep in mind for now is the fact that this namespace
shouldn't be considered just "EMERGENCY" because there are a lot of
different kinds of emergencies, some on a military scale ([RFC4412]
defines 3 of these), some on a national scale ([RFC4412] defines 2
of these), some on an international scale. These types of
emergencies can also have their own namespaces, and although there
are 5 defined for other uses, more are possible - so the 911/112/999
style of public user emergency calling for police or fire or
ambulance (etc) does not have a monopoly on the word "emergency".
Therefore the namespace "sos" has been chosen, as it is most
recognizable as that of citizen calling for help from a public
authority type of organization. This namespace will also be used
for communications between emergency authorities, and MAY be used
for emergency authorities calling public citizens. An example of
the later is a PSAP operator calling back someone who previously
called 9111/112/999 and the communication was terminated before it
should have been (in the operator's judgment).
Here is an example of a Resource-Priority header using the sos
namespace:
Resource-Priority: sos.0
Polk Expires January 2008 [Page 3]
Internet-Draft SIP RPH Namespace for Local Emergencies July 2007
3.1. Namespace Definition Rules and Guidelines
This specification defines one unique namespace for emergency
calling scenarios, "sos", constituting its registration with IANA.
This IANA registration contains the facets defined in Section 9 of
[RFC4412].
3.2. The "sos" Namespace
Per the rules of [RFC4412], each namespace has a finite set of
relative priority-value(s), listed (below) from lowest priority to
highest priority. In an attempt to not limit this namespace's use
in the future, more than one priority-value is assigned to the "sos"
namespace. This document does not RECOMMEND which priority-value is
used where. That is for another document to specify. This document
does RECOMMEND the choice within a national jurisdiction be
coordinated by all sub-jurisdictions to maintain uniform SIP
behavior throughout an emergency calling system.
The relative priority order for the "sos" namespace is as follows:
(lowest) sos.0
sos.1
sos.2
sos.3
(highest) sos.4
The "sos" namespace will be assigned into the priority queuing
algorithm (Section 4.5.2 of [RFC4412]) from the public user to the
PSAP. This does not limit its usage to only the priority queue
algorithm; meaning the preemption algorithm can be used where the
local jurisdiction preferred to preempt normal calls in lieu of
completing emergency calls. This document is not RECOMMENDING this
usage, merely pointing out that behaviors are a matter of local
policy.
NOTE: at this time, there has not been sufficient discussion about
whether or not preemption will be used for communications between
PSAPs or between PSAPs and First responders (and their
organizations).
4. IANA Considerations
4.1 IANA Resource-Priority Namespace Registration
Within the "Resource-Priority Namespaces" of the sip-parameters
section of IANA (created by [RFC4412]), the following entries will
be added to this table:
Polk Expires January 2008 [Page 4]
Internet-Draft SIP RPH Namespace for Local Emergencies July 2007
Intended New warn- New resp.
Namespace Levels Algorithm code code Reference
--------- ------ -------------- --------- --------- ---------
sos 5 queue no no [This doc]
4.2 IANA Priority-Value Registrations
Within the Resource-Priority Priority-values registry of the
sip-parameters section of IANA, the following (below) is to be added
to the table:
Namespace: sos
Reference: (this document)
Priority-Values (least to greatest): "0", "1","2", "3", "4"
5. Security Considerations
The Security considerations that apply to RFC 4412 [RFC4412] apply
here. This document introduces no new security issues relative to
RFC 4412.
That said, since this SIP header, used for emergency calling can
have a great impact on local communications, providers should use
caution when deciding if they want to use a preemption algorithm
within the public space for 911/112/999 type calling. As
potentially already limited communications bandwidth might starve
out all other types of calls in a location. This decision might be
desired; but this effect might not be desired.
6. Acknowledgements
Thanks to Ken Carlberg, Janet Gunn and Fred Baker for help with this
doc.
7. References
7.1 Normative References
[RFC2119] S. Bradner, "Key words for use in RFCs to Indicate
Requirement Levels", RFC 2119, March 1997
[RFC4412] Schulzrinne, H., Polk, J., "Communications Resource
Priority for the Session Initiation Protocol (SIP)", RFC
4411, Feb 2006
7.2 Informative References
none
Polk Expires January 2008 [Page 5]
Internet-Draft SIP RPH Namespace for Local Emergencies July 2007
Author's Address
James M. Polk
3913 Treemont Circle
Colleyville, Texas 76034
USA
Phone: +1-817-271-3552
Email: jmpolk@cisco.com
Full Copyright Statement
Copyright (C) The IETF Trust (2007).
This document is subject to the rights, licenses and restrictions
contained in BCP 78, and except as set forth therein, the authors
retain all their rights.
This document and the information contained herein are provided on an
"AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND
THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF
THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Intellectual Property
The IETF takes no position regarding the validity or scope of any
Intellectual Property Rights or other rights that might be claimed to
pertain to the implementation or use of the technology described in
this document or the extent to which any license under such rights
might or might not be available; nor does it represent that it has
made any independent effort to identify any such rights. Information
on the procedures with respect to rights in RFC documents can be
found in BCP 78 and BCP 79.
Copies of IPR disclosures made to the IETF Secretariat and any
assurances of licenses to be made available, or the result of an
attempt made to obtain a general license or permission for the use of
such proprietary rights by implementers or users of this
specification can be obtained from the IETF on-line IPR repository at
http://www.ietf.org/ipr.
The IETF invites any interested party to bring to its attention any
copyrights, patents or patent applications, or other proprietary
rights that may cover technology that may be required to implement
this standard. Please address the information to the IETF at
Polk Expires January 2008 [Page 6]
Internet-Draft SIP RPH Namespace for Local Emergencies July 2007
ietf-ipr@ietf.org.
Acknowledgment
Funding for the RFC Editor function is provided by the IETF
Administrative Support Activity (IASA).
Polk Expires January 2008 [Page 7]
| PAFTECH AB 2003-2026 | 2026-04-22 23:33:08 |