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Versions: 00 draft-ietf-ecrit-additional-data

ECRIT                                                           B. Rosen
Internet-Draft                                                   NeuStar
Intended status: Standards Track                           H. Tschofenig
Expires: September 2, 2010                        Nokia Siemens Networks
                                                           March 1, 2010


     Additional Data related to a Call for Emergency Call Purposes
                draft-rosen-ecrit-additional-data-00.txt

Abstract

   When an emergency call is sent to a PSAP, the device that sends it,
   as well as any service provider in the path of the call may have
   information about the call which the PSAP may be able to use.  This
   document describes an XML data structure that contains this kind of
   information in a standardized form.  A URI that points to the
   structure can be included in the SIP signaling with the call.

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and 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 September 2, 2010.

Copyright Notice

   Copyright (c) 2010 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal



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   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the BSD License.


Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Additional Data about a Call . . . . . . . . . . . . . . . . .  5
     3.1.  Data Provided by . . . . . . . . . . . . . . . . . . . . .  5
     3.2.  Provided by Company ID . . . . . . . . . . . . . . . . . .  6
     3.3.  Provided by Contact URI  . . . . . . . . . . . . . . . . .  6
     3.4.  Provided by Languages(s) supported . . . . . . . . . . . .  7
     3.5.  vCARD of Provided By . . . . . . . . . . . . . . . . . . .  7
     3.6.  Service Environment  . . . . . . . . . . . . . . . . . . .  8
     3.7.  Service Delivered by Provider to End User  . . . . . . . .  8
     3.8.  Device Classification  . . . . . . . . . . . . . . . . . . 10
     3.9.  Device Manufacturer  . . . . . . . . . . . . . . . . . . . 11
     3.10. Device Model Number  . . . . . . . . . . . . . . . . . . . 12
     3.11. Unique Device Identifier . . . . . . . . . . . . . . . . . 12
     3.12. Type of Device Identifier  . . . . . . . . . . . . . . . . 13
     3.13. Device/service specific additional data structure  . . . . 14
     3.14. Telephone Number Privacy Indicator . . . . . . . . . . . . 15
     3.15. vCARD for Subscriber's Data  . . . . . . . . . . . . . . . 16
   4.  XML Schema . . . . . . . . . . . . . . . . . . . . . . . . . . 17
   5.  Security Considerations  . . . . . . . . . . . . . . . . . . . 19
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 20
     6.1.  'emergencyCallData' Purpose Parameter Value  . . . . . . . 20
     6.2.  URN Sub-Namespace Registration for
           urn:ietf:params:xml:ns:additional-data . . . . . . . . . . 20
     6.3.  Additional Data Schema Registration  . . . . . . . . . . . 21
   7.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 22
   8.  Normative References . . . . . . . . . . . . . . . . . . . . . 23
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 24











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1.  Introduction

   When an emergency call is sent to a PSAP, there is a rich set of data
   in the headers with the call, but the device, as well as any other
   service provider in the path may have even more information that
   would be useful to a PSAP.  This information may include the identity
   and contact information of the service provider, subscriber identity
   and contact information, the type of service the service provider
   provides, what kind of device the user has, etc.  Some kinds of
   devices or services have device or service dependent data.  For
   example, a car telematics system or service may have crash
   information.  A medical monitoring device may have sensor data.
   While the details of the information may vary by device or service,
   there needs to be a common way to send such data to a PSAP.

   For the call takers this will enable more intelligent decision making
   and therefore better response in case of an emergency.  A pre-
   requisite is to offer the technical capabilities to let call takers
   to gain access to this information stored elsewhere (granted that
   they have authorization to access it).

   This document focuses on the data that can be obtained about a call
   and an existing SIP header field, the Call-Info header, is used for
   this purpose by defining a new token, namely 'emergencyCallData'
   carried in the "purpose" parameter.  If the "purpose" parameter set
   to 'emergencyCallData' then the Call-Info contains a HTTPS URL that
   points to an XML data structure with information about the call.  The
   initial XML data structure was defined by a working group within the
   National Emergency Number Association (NENA) and is included in this
   document.

   The data structure contains an element which itself is a URI that has
   device or service dependent data.  Thus the common Additional Data
   about a Call defined by this document contains a 'hook', in the form
   of a URI for a device or service dependent data structure.
















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2.  Terminology

   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 RFC 2119 [RFC2119].














































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3.  Additional Data about a Call

   The Additional Data about a Call is information specific to a call
   known by the device that sends it or a service provider in the path
   of a call.  The Additional Data about a Call is an XML data
   structure.  An HTTPS URI to that structure may be inserted in a SIP
   INVITE or MESSAGE transaction with a Call-Info header containing a
   purpose of "emergenyCallData".  The data, which must conform to the
   schema in Section 4 may be retrieved with an HTTPS Get. HTTPS MUST be
   used.

   More than one Call-Info header with an emergencyCallData purpose can
   be expected.  The device may insert one, and any intermediary service
   provider may insert its own.  When there are multiple intermediaries
   each intermediary may each insert one.  For example, a device may
   provide one, a telematics service provider may provide one and the
   mobile carrier handling the call may provide one.

3.1.  Data Provided by

   Data Element:  Data Provided by


   Use:  Required


   XML Element:  <DataProvidedBy>


   Description:  This is a plain language string suitable for displaying
      the name of the service provider that created the additional data
      structure.  If the device created the structure the value is
      identical to the contact header in the SIP Invite.  This data is
      required and should reflect the contact information of the owner
      of the device.


   Reason for Need:  Inform the call taker about the identity of the
      entity providing the additional call data structure.

   How Used by Call Taker:  Allows the call taker to interpret the data
      in this structure.  The source of the information often influences
      how the information is used, believed or verified.








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3.2.  Provided by Company ID

   Data Element:  Provided by Company ID


   Use:  Conditional


   XML Element:  <ProviderCompanyID>


   Description:  A jurisdiction specific code for the provider shown in
      the <DataProvidedBy> element that created the structure of the
      call.  NOTE: In the US, the NENA Company ID must appear here.
      Additional information may be found at
      http://www.nena.org/nena-company-id.  The NENA Company ID shall be
      in the form of any URI for example: urn:nena:companyid:<NENA
      Company ID>.  This data is required unless the additional data
      structure is provided by the device.


   Reason for Need:  Inform the call taker about the identity of the
      entity providing the additional call data structure.


   How Used by Call Taker:  Where jurisdictions have lists of providers
      the Provider Company ID can lead to a wealth of information
      associated with the code.

3.3.  Provided by Contact URI

   Data Element:  Provided by Contact URI


   Use:  Required


   XML Element:  <ContractURI>


   Description:  For a Service Provider the contact should be a 24x7
      contact number.  If provided by an entity without a 24X7, they
      must provide the provided by contact information.  This must be a
      SIP URI.  If a telephone number is the contact address it should
      be provided in the form of
      sip:telephonenumber@serviceprovider:user=phone.  If the call is
      from a device, this data is required and should reflect the
      contact information of the owner of the device.



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   Reason for Need:  Additional data providers may need to be contacted
      for error or other unusual circumstances.


   How Used by Call Taker:  To contact the supplier of the additional
      data provider structure.

3.4.  Provided by Languages(s) supported

   Data Element:  Provided by Language(s) supported


   Use:  Conditional


   XML Element:  <LanguagePreference>


   Description:  Provided by's alpha 2-character code as defined in ISO
      639-1:2002
      (http://www.iso.org/iso/catalogue_detail?csnumber=22109) Codes for
      the representation of names of languages -- Part 1: Alpha-2 code
      Multiple instances of this element may occur.  Order is
      significant; preferred language should appear first.  This data is
      required unless the message is from a data only device.


   Reason for Need:  Information needed to determine if 9-1-1 Authority
      can communicate with the Service Provider or if language line will
      be needed.


   How Used by Call Taker:  If call taker cannot speak language(s)
      supported by the Service Provider, language line will need to be
      added in to conversation.

3.5.  vCARD of Provided By

   Data Element:  vCARD of Provided By


   Use:  Optional


   XML Element:  <ProvidedByContact>






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   Description:  There are many fields in the vCARD.  The creator of the
      data structure is encouraged to provide as much information as
      they have available.  A minimum of subscriber provided by's name,
      address and contact number should be provided.


   Reason for Need:  Information needed to determine additional contact
      information.


   How Used by Call Taker:  Assists call taker by providing additional
      contact information that may not be included in the SIP invite or
      the PIDF-LO.  Can display a picture of the caller to the call
      taker.

3.6.  Service Environment

   Data Element:  Service Environment


   Use:  Required


   XML Element:  <SvcEnvironment>


   Description:  This defines if the call service type is a Business or
      Residence caller.  Currently, the only valid entries are Business
      or Residence.


   Reason for Need:  To assist in determining equipment and manpower
      requirements.


   How Used by Call Taker:  Information may be used to determine
      equipment and manpower requirements for emergency responders.

3.7.  Service Delivered by Provider to End User

   Data Element:  Service Delivered by Provider to End User


   Use:  Required







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   XML Element:  <SvcDelByProvider>


   Description:  This defines the type of service the end user has
      subscribed to.  The implied mobility of this service can not be
      relied upon.  A registry will reflect the following valid entries:

      *  Mobile Telephone Service: Includes Satellite, CDMA, GSM, Wi-Fi,
         WiMAX, LTE (Long Term Evolution)

      *  Fixed Public Pay/Coin telephones: Any coin or credit card
         operated device.

      *  One way outbound service

      *  Inmate call/service

      *  Soft dialtone/quick service/warm disconnect/suspended

      *  Multi-line telephone system (MLTS): Includes all PBX, Centrex,
         key systems, Shared Tenant Service.

      *  Sensor, unattended: Includes devices that generate DATA ONLY.
         This is one-way information exchange and there will be no other
         form of communication.

      *  Sensor, attended: Includes devices that are supported by a
         monitoring service provider or automatically open a two-way
         communication path.

      *  Wireline: Plain Old Telephone Service (POTS).

      *  VoIP Telephone Service: A type of service that offers
         communication over internet protocol, such as Fixed, Nomadic,
         Mobile, Unknown


   Reason for Need:  Knowing the type of service may assist the PSAP
      with the handling of the call.


   How Used by Call Taker:  Calltaker may be able to determine if the
      caller is stationary or mobile and if they will have voice
      communications with the caller or is it a data only event.







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3.8.  Device Classification

   Data Element:  Device Classification


   Use:  Optional


   XML Element:  <DeviceClassification>


   Description:  If the device provides the data structure, the device
      information should be provided.  If the Service Provider provides
      the structure and it knows what the device is, the Service
      Provider should provide the device information.  Often the carrier
      does not know what the device is.  It is possible to receive 2
      data structures, one created by the device and one created by the
      Service Provider.  Information about the device, not how it is
      being used.  This data element defines the kind of device making
      the emergency call.  A registry will reflect the following valid
      entries:

      *  Cordless handset

      *  Fixed phone

      *  Mobile handset

      *  ATA - analog terminal adapter

      *  Satellite phone

      *  Stationary computing device (alarm system, data sensor)

      *  Guardian devices

      *  Desktop PC

      *  Laptop computing device

      *  Tablet computing device

      *  Alarm system

      *  Data sensor

      *  Personal beacons (spot)




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      *  Auto telematics (indicates VEDS data set)

      *  Trucking telematics

      *  Farm equipment telematics

      *  Marine telematics

      *  PDA (personal digital assistant)

      *  PND (personal navigation device)

      *  Smart phone

      *  Internet tablet

      *  Gaming console

      *  Video phone

      *  Other text device

      *  Not Available


   Reason for Need:  The device classification describes the capability
      of the calling device.  For example, does the device require human
      intervention to initiate a call or is this call the result of
      programmed instructions.  Does the calling device have the ability
      to rebid for location or condition changes?  Is this device
      interactive or a one-way reporting device?


   How Used by Call Taker:  May assist with location of caller.  For
      example, a cordless handset may be outside or next door.  May
      provide calltaker some context about the caller.

3.9.  Device Manufacturer

   Data Element:  Device Manufacturer


   Use:  Optional








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   XML Element:  <DeviceMfgr>


   Description:  Manufacturer is electronically stored on the device.
      Different devices may use different conventions to provide their
      information.  We need to know what it represents, so a registry is
      in order.  Need to be able to standardize as much as possible with
      a uniform naming convention.  A registry will reflect the valid
      entries.


   Reason for Need:  Used by PSAP management for post-mortem
      investigation/resolution.


   How Used by Call Taker:  Probably not used by calltaker, but by PSAP
      management.

3.10.  Device Model Number

   Data Element:  Device Model Number


   Use:  Optional


   XML Element:  <DeviceModelNr>


   Description:  Model number is electronically stored on the device.


   Reason for Need:  Used by PSAP management for after action
      investigation/resolution.


   How Used by Call Taker:  Probably not used by calltaker, but by PSAP
      management.

3.11.  Unique Device Identifier

   Data Element:  Unique Device Identifier


   Use:  Optional






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   XML Element:  <UniqueDeviceID>


   Description:  Characters that identify the specific device making the
      call or creating an event.


   Reason for Need:  May be needed when trying to obtain a subpoena to
      obtain customer information in instances where location info did
      not display or someone is making false emergency calls.  May also
      be used when working with safe houses that are using non-
      initialized phones.


   How Used by Call Taker:  Probably not used by calltaker they would
      need to refer to management for investigation.

3.12.  Type of Device Identifier

   Data Element:  Type of Device Identifier


   Use:  Optional


   XML Element:  <TypeOfDeviceID>


   Description:  Identifies the type of device identifier being
      generated in the unique device identifier data element.  A
      registry will reflect the following valid entries:

      *  MEID (CDMA)

      *  ESN (Electronic Serial Number - superseded by MEID)

      *  MAC (Media Access Control) Address - any IEEE device with an
         Ethernet, Wi-Fi connection

      *  WiMAX has a device certificate

      *  IMEI (International Mobile Equipment Identifier - GSM)

      *  Unique Device Identifier (Unique identifier for medical
         devices)

      *  RFID (Radio Frequency Identification)




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      *  Sensors (types to be identified in a future document version)

      *  Manufacturer Serial Number


   Reason for Need:  Calls from uninitiated devices would give an
      identifier that could be associated with erroneous calls --- use
      the number to identify what type of capabilities there are.  Could
      also use this information to block specific types of calls.


   How Used by Call Taker:  Additional information that may be used to
      assist with call handling.

3.13.  Device/service specific additional data structure

   Data Element:  Device/service specific additional data structure


   Use:  Optional


   XML Element:  <devicespecificSchema>


   Description:  A URI representing additional data whose schema is
      specific to the device or service which created it.  An example is
      the VEDs structure for a vehicle telematics device.  The structure
      can be referenced via URI and used in the policy routing function
      business rules/policies or for access by call takers or
      responders.  Non-NENA XML schemas must be registered.  Some
      possible sources are:

      *  NPAC

      *  Hazmat International Association of Fire Chiefs

      *  DHS/EPA E-Plan for HazMat

      *  NFPA - National Fire Protection Association

      *  National Alliance for Public Safety GIS (NA-PSG)

      *  US DOT Pipeline and Hazardous Materials Safety Administration
         (PHMSA) examples of additional data.

      *  Fire Service Data Model




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      *  IEEE 1512 - USDOT Model for traffic incidents

      *  Smart Building (NIST)

      *  VEDS

      Different data may be created by each classification; i.e.,
      telematics creates VEDS data set - can be different types of data
      depending on device.  May want to describe type of data for each
      device.


   Reason for Need:  This data element will allow for identification of
      externally defined schemas, which may have additional data that
      will assist in emergency response.


   How Used by Call Taker:  This data element will allow the end user
      (calltaker or first responder) to know what type of additional
      data may be available to aid in providing the needed emergency
      services.

3.14.  Telephone Number Privacy Indicator

   Data Element:  Telephone Number Privacy Indicator


   Use:  Required


   XML Element:  <TNPrivacyIndicator>


   Description:  Some State regulations require that Non-Published
      subscriber name remains private to all including 9-1-1.  Where
      this regulation is in place, the end user's name must be overlaid
      with blanks or the verbiage, "Non-Published Number."


   Reason for Need:  Some State regulations require that Non-Published
      subscriber name remains private to all including emergency calls.
      Where this regulation is in place, the end user's name must be
      overlaid with blanks or the verbiage, "Non-Published Number".








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   How Used by Call Taker:  This is not beneficial to PSAPs; however,
      they must follow state regulations.  This indicator will allow for
      coding that overlays the non-published subscriber name with the
      verbiage "Non-Published Number."

3.15.  vCARD for Subscriber's Data

   Data Element:  vCARD for Subscriber's Data


   Use:  Required


   XML Element:  <SubscriberData>


   Description:  Information known by the Service Provider about the
      subscriber; i.e., Name, Address, Calling Party Number, Main
      Telephone Number and any other data.  If the subscriber is an
      enterprise, this is the vCARD of the enterprise and the Company
      Name is used not the Name of the Caller.  The telephone number is
      the main telephone number at the location of the call.  The
      address should be where the call is originating from.


   Reason for Need:  Critical information required for proper call
      handling and dispatching.


   How Used by Call Taker:  Critical information required for proper
      call handling and dispatching.




















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4.  XML Schema


   <?xml version="1.0" encoding="UTF-8"?>
   <xsd:schema
       xmlns:xsd="http://www.w3.org/2001/XMLSchema"
       xmlns="urn:nena:xml:ns:es:NG:Call"
       targetNamespace="urn:nena:xml:ns:es:NG:Call"
       elementFormDefault="qualified"
       attributeFormDefault="unqualified" version="1.0">
       <xsd:include schemaLocation="NGTypeLib.xsd"/>
       <xsd:element name="DataAssociatedWithCall">
           <xsd:complexType>
               <xsd:sequence>
                   <xsd:element name="DataProvidedBy"
                       type="sourceProviderType" minOccurs="0"/>
                   <xsd:element ref="CallerDataURL" minOccurs="0"/>
                   <xsd:element ref="ServiceEnvironment"/>
                   <xsd:element ref="ServiceDeliveredByProvider"/>
                   <xsd:element ref="DeviceClassification"/>
                   <xsd:element ref="DeviceManufacturer"/>
                   <xsd:element name="DeviceModel" type="xsd:token"/>
                   <xsd:element name="DeviceID" type="xsd:token"/>
                   <xsd:element ref="DeviceIDType"/>
                   <xsd:element name="DeviceSpecificSchema"
                       type="ExtensionType" minOccurs="0"/>
                   <xsd:element ref="PrivacyIndicator"/>
                   <xsd:element ref="SubscribervCARD"/>
               </xsd:sequence>
           </xsd:complexType>
       </xsd:element>
       <xsd:element name="CallerDataURL" type="xsd:anyURI">
       </xsd:element>
       <xsd:element name="ServiceDeliveredByProvider" type="xsd:token">
       </xsd:element>
       <xsd:element name="DeviceClassification" type="xsd:token">
       </xsd:element>
       <xsd:element name="DeviceManufacturer" type="xsd:token">
       </xsd:element>
       <xsd:element name="DeviceIDType" type="xsd:token">
       </xsd:element>
       <xsd:element name="PrivacyIndicator" type="privacyIndicatorType">
       </xsd:element>
       <xsd:simpleType name="privacyIndicatorType">
           <xsd:restriction base="xsd:token">
               <xsd:enumeration value="Published"/>
               <xsd:enumeration value="Non-Published"/>
           </xsd:restriction>



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       </xsd:simpleType>
       <xsd:element name="SubscribervCARD" type="vCARDType">
       </xsd:element>
   </xsd:schema>

                           Figure 1: XML Schema













































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5.  Security Considerations

   The information in this data structure will usually be considered
   private.  HTTPS is specified to require the provider of the
   information to validate the credentials of the requester.  While the
   creation of a PKI that has global scope may be difficult, the
   alternatives to creating devices and services that can provide
   critical information securely are more daunting.

   The Call-info header with purpose='emergencyCallData' MUST only be
   sent on an emergency call, which can be ascertained by the presence
   of an emergency service urn in a Route header of a SIP message.

   <how recipient validates credentials of sender>

   <how sender validates credentials of recipient>

   <how sender validates credentials of anyone requesting device
   dependent data>
































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6.  IANA Considerations

6.1.  'emergencyCallData' Purpose Parameter Value

   This document defines the 'emergencyCallData' value for the "purpose"
   parameter of the Call-Info header field.  A reference to this RFC (in
   double brackets) has been added to the existing "purpose" Call-Info
   parameter entry in the SIP Parameters registry, which currently looks
   as follows:


                                       Predefined
      Header Field    Parameter Name     Values     Reference
      -------------   --------------   ---------   ---------
      Call-Info         purpose           Yes      [RFC3261][RFC5367]

6.2.  URN Sub-Namespace Registration for
      urn:ietf:params:xml:ns:additional-data

   This section registers a new XML namespace, as per the guidelines in
   [RFC3688].

   URI:  urn:ietf:params:xml:ns:additional-data

   Registrant Contact:  IETF, ECRIT working group, <ecrit@ietf.org>, as
      delegated by the IESG <iesg@ietf.org>.

   XML:


      BEGIN
      <?xml version="1.0"?>
      <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
        "http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
      <html xmlns="http://www.w3.org/1999/xhtml">
      <head>
        <meta http-equiv="content-type"
              content="text/html;charset=iso-8859-1"/>
        <title>Additional Data Namespace</title>
      </head>
      <body>
        <h1>Namespace for Additional Data </h1>
        <h2>urn:ietf:params:xml:ns:additional-data</h2>
      <p>See [TBD].</p>
      </body>
      </html>
      END




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6.3.  Additional Data Schema Registration

   This specification registers a schema, as per the guidelines in
   [RFC3688].

      URI: urn:ietf:params:xml:schema:additional-data

      Registrant Contact: IETF, ECRIT Working Group (geopriv@ietf.org),
      as delegated by the IESG (iesg@ietf.org).

      XML: The XML can be found as the sole content of Section 4.








































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7.  Acknowledgments

   The authors would like to thank the following persons for their work
   in the NENA Data Technical Committee: Delaine Arnold (Data Technical
   Committee Chair), Marc Berryman, Erica Aubut (Data Technical
   Committee Vice-Chair), Susan Sherwood, Ric Atkins, Patty Bluhm,
   Eileen Boroski, David Connel, Maryls Davis, Paul-David de la Rosby,
   Gordon Chinander, David Froneberger, Marilyn Haroutunian, Roger
   Hixson, Rick Jones, Roger Marshall, Tom Muehleisen, Ira Pyles, Carl
   Reed, Susan Seet, and Skip Walls.  The authors would also like to
   thank Tom Breen, Technical Committee Chair/Liaison; Busam, Technical
   Committee Vice-Chair/Liaison; Pete Eggimann, Operations Committee
   Chair/Liaison; Wendy Lively, Operations Committee Chair/Liaison;
   Roger Hixson, Technical Director; and Rick Jones, Operations Issues
   Director for their support and assistance.




































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8.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
              January 2004.












































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Authors' Addresses

   Brian Rosen
   NeuStar
   470 Conrad Dr.
   Mars, PA  16046
   US

   Phone: +1 724 382 1051
   Email: br@brianrosen.net


   Hannes Tschofenig
   Nokia Siemens Networks
   Linnoitustie 6
   Espoo  02600
   Finland

   Phone: +358 (50) 4871445
   Email: Hannes.Tschofenig@gmx.net
   URI:   http://www.tschofenig.priv.at






























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