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Versions: (draft-petrie-sipping-config-framework) 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 RFC 6080

SIPPING                                                        D. Petrie
Internet-Draft                                                SIPez LLC.
Intended status: Standards Track                   S. Channabasappa, Ed.
Expires: September 4, 2007                                     CableLabs
                                                           March 3, 2007


A Framework for Session Initiation Protocol User Agent Profile Delivery
                 draft-ietf-sipping-config-framework-11

Status of this Memo

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   This Internet-Draft will expire on September 4, 2007.

Copyright Notice

   Copyright (C) The IETF Trust (2007).

Abstract

   This document defines a framework to enable configuration of Session
   Initiation Protocol (SIP) User Agents in SIP deployments.  The
   framework provides a means to deliver profile data that User Agents
   need to be functional, automatically and with minimal (preferably
   none) User and Administrative intervention.  The framework describes
   how SIP User Agents can discover sources, request profiles and
   receive notifications related to profile modifications.  As part of



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   this framework, a new SIP event package is defined for notification
   of profile changes.  The framework provides for multiple data
   retrieval options, without requiring or defining retrieval protocols.
   The framework does not include specification of the profile data
   within its scope.


Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
     3.1.   Reference Model . . . . . . . . . . . . . . . . . . . . .  5
     3.2.   Data Model and Profile Types  . . . . . . . . . . . . . .  9
     3.3.   Profile Life Cycle  . . . . . . . . . . . . . . . . . . .  9
   4.  Use Cases  . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     4.1.   Simple Deployment Scenario  . . . . . . . . . . . . . . . 10
     4.2.   Devices supporting multiple users from different
            Service Providers . . . . . . . . . . . . . . . . . . . . 12
   5.  Profile Delivery Framework . . . . . . . . . . . . . . . . . . 14
     5.1.   Profile Enrollment  . . . . . . . . . . . . . . . . . . . 17
       5.1.1.  Creation of Enrollment Subscription  . . . . . . . . . 17
       5.1.2.  Profile Enrollment Request Transmission  . . . . . . . 24
       5.1.3.  Profile Enrollment Notification  . . . . . . . . . . . 24
     5.2.   Profile Content Retrieval . . . . . . . . . . . . . . . . 25
     5.3.   Profile Change Operation  . . . . . . . . . . . . . . . . 25
     5.4.   Profile Change Notification . . . . . . . . . . . . . . . 25
     5.5.   Additional Considerations . . . . . . . . . . . . . . . . 25
       5.5.1.  Manual retrieval of the Device Profile . . . . . . . . 26
       5.5.2.  Device Types . . . . . . . . . . . . . . . . . . . . . 26
       5.5.3.  Profile Data . . . . . . . . . . . . . . . . . . . . . 27
       5.5.4.  Profile Data Frameworks  . . . . . . . . . . . . . . . 27
       5.5.5.  Additional Profile Types . . . . . . . . . . . . . . . 28
       5.5.6.  Deployment considerations  . . . . . . . . . . . . . . 28
   6.  Event Package Definition . . . . . . . . . . . . . . . . . . . 28
     6.1.   Event Package Name  . . . . . . . . . . . . . . . . . . . 29
     6.2.   Event Package Parameters  . . . . . . . . . . . . . . . . 29
     6.3.   SUBSCRIBE Bodies  . . . . . . . . . . . . . . . . . . . . 32
     6.4.   Subscription Duration . . . . . . . . . . . . . . . . . . 33
     6.5.   NOTIFY Bodies . . . . . . . . . . . . . . . . . . . . . . 33
     6.6.   Notifier Processing of SUBSCRIBE Requests . . . . . . . . 33
     6.7.   Notifier Generation of NOTIFY Requests  . . . . . . . . . 34
     6.8.   Subscriber Processing of NOTIFY Requests  . . . . . . . . 35
     6.9.   Handling of Forked Requests . . . . . . . . . . . . . . . 35
     6.10.  Rate of Notifications . . . . . . . . . . . . . . . . . . 35
     6.11.  State Agents  . . . . . . . . . . . . . . . . . . . . . . 35
   7.  Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
     7.1.   Example 1: Device requesting profile  . . . . . . . . . . 36



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     7.2.   Example 2: Device obtaining change notification . . . . . 39
   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 43
     8.1.   SIP Event Package . . . . . . . . . . . . . . . . . . . . 43
     8.2.   New HTTP Event Header . . . . . . . . . . . . . . . . . . 43
   9.  Security Considerations  . . . . . . . . . . . . . . . . . . . 44
     9.1.   Profile Enrollment and Change Notification  . . . . . . . 47
     9.2.   Profile Content Retrieval . . . . . . . . . . . . . . . . 49
     9.3.   Profile Change Operation  . . . . . . . . . . . . . . . . 50
   10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 51
   11. Change History . . . . . . . . . . . . . . . . . . . . . . . . 51
     11.1.  Changes from
            draft-ietf-sipping-config-framework-10.txt  . . . . . . . 51
     11.2.  Changes from
            draft-ietf-sipping-config-framework-09.txt  . . . . . . . 52
     11.3.  Changes from
            draft-ietf-sipping-config-framework-08.txt  . . . . . . . 52
     11.4.  Changes from
            draft-ietf-sipping-config-framework-07.txt  . . . . . . . 53
     11.5.  Changes from
            draft-ietf-sipping-config-framework-06.txt  . . . . . . . 53
     11.6.  Changes from
            draft-ietf-sipping-config-framework-05.txt  . . . . . . . 54
     11.7.  Changes from
            draft-ietf-sipping-config-framework-04.txt  . . . . . . . 54
     11.8.  Changes from
            draft-ietf-sipping-config-framework-03.txt  . . . . . . . 54
     11.9.  Changes from
            draft-ietf-sipping-config-framework-02.txt  . . . . . . . 55
     11.10. Changes from
            draft-ietf-sipping-config-framework-01.txt  . . . . . . . 55
     11.11. Changes from
            draft-ietf-sipping-config-framework-00.txt  . . . . . . . 55
     11.12. Changes from
            draft-petrie-sipping-config-framework-00.txt  . . . . . . 56
     11.13. Changes from draft-petrie-sip-config-framework-01.txt . . 56
     11.14. Changes from draft-petrie-sip-config-framework-00.txt . . 56
   12. References . . . . . . . . . . . . . . . . . . . . . . . . . . 57
     12.1.  Normative References  . . . . . . . . . . . . . . . . . . 57
     12.2.  Informative References  . . . . . . . . . . . . . . . . . 58
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 58
   Intellectual Property and Copyright Statements . . . . . . . . . . 60










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1.  Introduction

   SIP User Agents require configuration data to function properly.
   Examples include network, device and user specific information.
   Ideally, this configuration process should be automatic and require
   minimal or no user intervention.

   Many deployments of SIP User Agents require dynamic configuration and
   cannot rely on pre-configuration.  This framework provides a standard
   means of providing dynamic configuration which simplifies deployments
   containing SIP User Agents from multiple vendors.

   This framework also addresses modifications to profiles and the
   corresponding change notifications to the SIP User Agents using a new
   event package.  However, the framework does not define the content or
   format of the actual profile data, leaving that to future
   standardization activities.


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].

   This document also reuses the SIP terminology defined in [RFC3261]
   and [RFC3265], and specifies the usage of the following terms.

   Device:  software or hardware entity containing one or more SIP user
      agents.  It may also contain entities such as a DHCP client.


   Device Provider:  the entity responsible for managing a given device


   Local Network Provider:  the entity that controls the local network
      to which a given device is connected


   SIP Service Provider:  the entity providing SIP services to users.
      This can refer to private enterprises or public entities.


   Profile:  configuration data set specific to an entity (for example,
      user, device, local network or other).






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   Profile Type:  a particular category of Profile data (for example,
      User, Device, Local Network or other).


   Profile Delivery Server (PDS):  the source of a Profile, it is the
      logical collection of the Profile Notification Component (PNC) and
      the Profile Content Component(PCC).


   Profile Notification Component (PNC):  the logical component of a
      Profile Delivery Server that is responsible for enrolling devices
      and providing profile notifications.


   Profile Content Component (PCC):  the logical component of a Profile
      Delivery Server that is responsible for storing, providing access
      to, and accepting profile content.






3.  Overview

   This section provides an overview of the configuration framework.  It
   introduces the reference model and explains key concepts such as the
   Profile Life Cycle and the Profile Types.  It is meant to serve as a
   reference section for the document, rather than providing a specific
   logical flow of material, as it may be necessary to revisit these
   sections for a complete understanding of this document.  The detailed
   framework for the profile delivery, presented in Section 5, is based
   on the concepts introduced in this section.

3.1.  Reference Model

   The design of the framework was the result of a careful analysis to
   identify the configuration needs of a wide range of SIP deployments.
   As such, the reference model provides for a great deal of
   flexibility, while breaking down the interactions to their basic
   forms which can be reused in many different scenarios.

   In its simplest form, the reference model for the framework defines
   the interactions between the Profile Delivery Server(PDS) and the
   device.  The device needs the profile data to effectively function in
   the network.  The PDS is responsible for responding to device
   requests and providing the profile data.  The set of interactions
   between these entities is referred to as the Profile Life Cycle.



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   This reference model is illustrated in the diagram below.




                                           +-------------------------+
    +--------+       Interactions         | Profile Delivery Server |
    | Device |<==========================>|  +---+          +---+   |
    +--------+    (Profile Life Cycle)    |  |PNC|          |PCC|   |
                                          |  +---+          +---+   |
                                           +-------------------------+

                                PNC = Profile Notification Component
                                PCC = Profile Content Component



                         Framework Reference Model


   The PDS is subdivided into two logical components:
   o  Profile Notification Component (PNC), responsible for enrolling
      devices in Profile event subscriptions and providing Profile
      change notifications;
   o  Profile Content Component (PCC), responsible for storing,
      providing access to, and accepting modifications related to
      profile content.

   SIP deployments vary considerably.  For the sake of simplicity, two
   deployment scenarios representing either end of the SIP deployment
   spectrum are presented.

   In the simplest scenario, a device connects through a network that is
   controlled by a single provider who provides the local-network,
   manages the devices, and offers services to the users.  The Provider
   propogates profile data to the device that contains all the necessary
   information to obtain services in the network (including information
   related to the local-network and the users).  This is illustrated in
   the following diagram.












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            --------------
          / Local-network, \
         | Device & Service |
          \    Provider    /
           ----------------
                  |
                  |
               --------
              | Device |
               --------
                  |
                  |
                ----
               |User|
                ----



                         Simple System Level Model

   There are also deployments where the device can connect via a local
   network that is not controlled by the SIP Service Provider, for
   example, devices that connect via available public WiFi hotspots.  In
   such cases, Local Network Providers may wish to provide local network
   information such as bandwidth constraints to the devices.

   Devices may also be controlled by Device Providers that are
   independent of the SIP Service Provider who provides user services,
   for example, kiosks that allow users to access services anywhere.  In
   such cases the profile data may have to be obtained from different
   profile sources: local network provider, device provider and SIP
   service provider.  This is indicated in the following diagram.



















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         --------
       /   SIP    \
      |   Service  |                -> Provides 'user' profile
      |  Provider  |                   data (e.g., services
       \          /                    configuration)
         --------      --------
             |       /          \
             |      |   Device   |  -> Provides 'device' profile
             |      |  Provider  |     data (e.g., device specifics)
             |       \          /
             |         ---------
             |        /
             |       /    -------
             |      /   /  Local  \
             |     /   |  Network  |
             |    |    |  Provider | -> Provides 'local-network' profile
             |    |     \         /     data (e.g., bandwidth)
             |    |       -------
             |    |        /
             |    |       /
             |    |      |
        ===================
       (   Local Network   )
        ===================
                |
                |
             --------
            | Device |              -> Needs the 'local-network'
             --------                  and 'device' profile
             /     \
            /       \
          ------   ------
         |User A| |User B|          -> Users need 'user' profiles
          ------   ------



                        General System Level Model


   As illustrated, the simplest deployments present a single profile
   source whereas others may present multiple profile sources.  To be
   effective, a configuration framework needs to address various
   deployment scenarios.  To address a vast majority of deployments this
   framework specifies three distinct profiles, each of which can be
   obtained from a different provider, and a profile life cycle common
   to any profile type.




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   The understanding is that deployments in general will support the
   defined profile types.  However, the framework allows for flexibility
   in specialized cases.  The devices are required to support all the
   three profile types, unless configured otherwise (at a minimum they
   need to support the device profile).  The deployments are required to
   support the device profile, and user profiles for known users.  In
   the presence of multiple profiles, a retrieval order is specified for
   the devices.  Additional profiles may also be specified outside the
   scope of this document, but are expected to follow the same profile
   life cycle.


3.2.  Data Model and Profile Types

   This framework specifies the following three profiles.  Additional
   extended profiles may also be defined.

   Local Network Profile:  contains configuration data related to the
      local network to which a device is directly connected.  It is
      expected to be provided by the Local Network Provider.


   Device Profile:  cContains configuration data related to a specific
      device, provided by the Device Provider.


   User Profile:  contains configuration data related to a specific
      User, as required to reflect that user's preferences and the
      particular services subscribed to.  It is expected to be provided
      by the SIP Service Provider providing services.



3.3.  Profile Life Cycle

   Automated profile delivery requires proactive behavior on the part of
   a device.  It also requires one or more PDSs which provide the
   profile data.  The set of communications that results in profile
   delivery is characterized by the profile life cycle.  Each profile is
   propogated using the profile life cycle.

   The life cycle is initiated when the device enrolls for profile data.
   Enrollment either results in profile data or in information
   referencing content indirection.  In the case of content indirection,
   the provided retrieval procedures are used to retrieve the profile.
   Additionally, the profile life cycle allows for profile change
   operations by authorized entities.  If a profile change operation is
   successful, it results in profile change notifications to all



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   enrolled devices.

   The specific functional steps are as follows:

   Profile Enrollment:  the process by which a device requests, and if
      successful, enrolls with a PDS capable of providing a profile.  A
      successful enrollment is indicated by a notification containing
      the profile information (contents or content indirection
      information).  Depending on the request, this could also result in
      a subscription to notification of profile changes.


   Profile Content Retrieval:  the process by which a device retrieves
      profile contents, if the profile enrollment resulted in content
      indirection information.


   Profile Change Notification:  the process by which a device is
      notified of any changes to an enrolled profile.  This may provide
      the device with modified profile data or content indirection
      information.


   Profile Change Operation:  The process by which an authorized entity
      - such as a configuration management server or a device - pushes a
      profile change to the PDS.




4.  Use Cases

   This section provides a small - non-comprehensive - set of
   representative use cases to further illustrate how this Framework can
   be utilized in SIP deployments.  The first use case is simplistic in
   nature, where as the second is relatively complex.  The use cases
   illustrate the effectiveness of the framework in either scenario.

   For Security Considerations please refer to Section 9.

4.1.  Simple Deployment Scenario

   Description: Consider a deployment scenario (for example, a small
   private enterprise) where a single entity enables the local network,
   manages deployed devices and provides SIP services.  The devices
   never connect outside the local network and are each pre-configured
   with a single user.




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   The following assumptions apply:
   o    The device profile data contains all the information necessary
        for the device to participate in the local network and obtain
        services
   o    The device is pre-configured to only request the device profile
   o    The enrollment notification contains the profile data (profile
        content retrieval is not required)

   The following diagram illustrates this use case and highlights the
   communications relevant to the framework specified in this document.




                                      +----------------------+
 +--------+                           | Local Network, Device|
 | Device |                           |& SIP Service Provider|
 |(SIP UA)|                           |                      |
 +--------+                           |  DHCP        PDS     |
                                      +----------------------+
      |                                   |          |
 (A)  |<============== DHCP =============>|          |
      |                                              |
      |                                              |
      |                                              |
 (B)  |<=========== Profile Enrollment  ============>|
      |                                              | Profile data
      |                                              | is modified
      |                                              | via "Profile
      |                                              | Change Operation"
      |                                              |
 (C)  |<============ Profile Change  ================|
      |               Notification                   |
      |                                              |
      |                                              |






   The following is an explanation of the interactions in the diagram.
   (A)  Upon initialization, the device obtains IP configuration
        parameters using DHCP







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   (B)  The device performs Profile Enrollment for the device profile;
        the device profile data is contained in the enrollment
        notification
   (C)  Due to a modification of the device profile, a Profile Change
        Notification is sent across to the device, along with the
        modified profile

4.2.  Devices supporting multiple users from different Service Providers

   Description: Consider a single device (for example, Kiosk at an
   airport) that allows for multiple users to obtain services from a
   list of pre-configured SIP Service Providers.

   The following assumptions apply:
   o    Provider A is the Device and Local Network Provider for the
        device, and the SIP Service Provider for user A; Provider B is
        the SIP Service Provider for user B
   o    Profile enrollment always results in content indirection
        information requiring profile content retrieval

   The following diagram illustrates the use case and highlights the
   communications relevant to the framework specified in this document.





























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     User User
       A   B        +----------------------+  +----------------------+
    +--------+      |       Provider       |  |       Provider       |
    | Device |      |           A          |  |          B           |
    |(SIP UA)|      |                      |  |                      |
    +--------+      | DHCP    PROXY   PDS  |  |  PROXY        PDS    |
                    +----------------------+  +----------------------+
         |              |        |      |          |           |
     (A) |<====DHCP====>|        |      |          |           |
         |                       |      |          |           |
         |                       |      |          |           |
         |  Profile Enrollment   |      |          |           |
     (B) |<local-network profile>|<====>|          |           |
         |
         |   <<Profile content retrieval>>
         |
         |
         |  Profile Enrollment   |      |          |           |
     (C) |<== device profile ==> |<====>|          |           |
         |
         |   <<Profile content retrieval>>
         |
                      .
                      .
                      .
             [[User A obtains services]]



         |   Profile Enrollment  |      |          |           |
     (D) |<= user profile (A) => |<====>|          |           |
         |                       |      |          |           |
         |
         |   <<Profile content retrieval>>
                              .
                      .
                      .
                      .
             [[User B obtains services]]

         |
         |            Profile Enrollment           |           |
     (E) |<=========== user profile (B) ==========>|<=========>|
         |                                         |           |
         |   <<Profile content retrieval>>
         |





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   The following is an explanation of the interactions in the diagram.
   (A)  Upon initialization, the device obtains IP configuration
        parameters using DHCP.  This also provides the local domain
        information to help with local-network profile enrollment
   (B)  The device requests profile enrollment for the local network
        profile.  It receives an enrollment notification containing
        content indirection information from Provider A's PDS.  The
        device retrieves the profile (this contains useful information
        such as firewall port restrictions and available bandwidth)
   (C)  The device then requests profile enrollment for the device
        profile.  It receives an enrollment notification resulting in
        device profile content retrieval.  The device initializes the
        User interface for services.
   (D)  User A with a pre-existing subscription with Provider A attempts
        communication via the user Interface.  The device uses the user
        supplied information (including any credential information) and
        requests profile enrollment for user A's profile.  Successful
        enrollment and profile content retrieval results in services for
        user A.
   (E)  At a different point in time, user B with a pre-existing
        subscription with Provider B attempts communication via the user
        Interface.  It enrolls and retreives user B's profile and this
        results in services for user B.


5.  Profile Delivery Framework

   This section details the framework requirements.  The Profile Life
   Cycle (introduced in Section 3), is examined in further detail, with
   requirements that apply to the device and the PDS.  Unless explicitly
   enhanced or indicated by an implementing specification, the device
   and the PDS MUST follow the Profile Life Cycle requirements stated in
   this section for all supported profile types.

   A high-level representation of the framework is shown in the
   following state diagram.  Each of the specified profile types is
   retrieved individually, in the specified order (see below), until all
   needed Profiles have been received.













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                          ---------------
                         /    Device     \
                         \ Initialization/
                          ---------------
                                |
                                | Completes IP initialization;
                                | Initializes SIP stack
                                |
                                V
                          --------------
               ________\ / All profiles?\
              |        / \ retrieved?   /
              |           --------------
              |                 |
              |                 | NO; attempt
              |                 | Profile Request
              |                 | in specified order
              |                 |
              |                 V
              |            ------------
               ___________/  Profile   \
                          \ Life Cycle /
                           ------------


                          Framework state diagram

   The Profile Life Cycle, for each profile, is illustrated in the
   diagram below.






















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                         -------------     { Device enrolls
                        /   Profile   \ ...{ and obtains
                        \  Enrollment /    { enrollment
                         -------------     { notification
                               |
                               |
                            SUCCESS
                               |
                               |
                 ...PDS...     V     ...DEVICE...
               __________________________________
             |                                   |
             |                                   |
           Active                                |
       Subscription?                             |
      (i.e, not a one                            |
         time fetch)                             |
             |                                   |
             | YES                               |
             |                                   |
             V                                   V
       --------------
     / Profile Change \ __________________\   Content
     \  Notification  /                   / Indirection?
       --------------                            |
             ^                                   |
             |                                   | YES
             | SUCCESS                           |
             |                                   V
       --------------                    ----------------
     / Profile Change\                  / Profile Content \
     \   Operation   /                  \    Retrieval    /
      ---------------                    -----------------






   The Profile Life Cycle is initiated when the device transmits an
   enrollment request for a specific profile.  If this is accepted, it
   results in an enrollment notification that contains the profile data
   or profile content indirection information.  Unless the enrollment
   request indicates a one-time profile request, it also results in
   enrollment for profile change notifications.  If the profile is
   modified at any point in time, the profile change notification is
   transmitted to the device.  Notifications due to profile enrollment
   or change operation may result in content indirection in which case



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   the device uses profile content retrieval to obtain the profile data.

   The Profile Life Cycle is the same for all the profile types, but
   there are different requirements in each step based on the profile
   types.  This framework defines three profile types and an order that
   MUST be followed by the device in requesting them (when it retrieves
   two or more of the defined profile types), as follows:

   o  local-network
   o  device
   o  user

   The sub-sections that follow specify the Profile Life Cycle details,
   with specific requirements based on each profile type.

5.1.  Profile Enrollment

   The first step to obtaining a profile is PDS Enrollment.  This is
   initiated by the device and involves:

   o  creating a profile enrollment subscription
   o  transmitting a profile enrollment request
   o  receiving a profile enrollment notification


   The processes are interlinked and retries encompass all three phases.
   For example, if the enrollment request does not result in a profile
   enrollment notification, the device is required to retry alternate
   profile enrollment subscription creation options.  Only when all the
   enrollment subscription creation options are exhausted does the
   device assume that the profile enrollment has failed.  The processes
   themselves are illustrated in the following sub-sections.


5.1.1.  Creation of Enrollment Subscription


   Each profile type requires its own subscription and based on the
   entity requesting it, presents certain unique requirements (for
   example, the device identifier is provided for the device profile
   type where as the user identifier is provided for the user profile
   type).  Further, the profile types are aimed at different PDSs and
   hence are identified differently (for example, the local-network is
   identified by the local domain name where as the Service Provider is
   identified based on the Service Provider's domain name).  Some of
   this information can be obtained in multiple ways (such as local
   domain information that can be configured statically or dynamically)
   and the device may have to try different information sources to



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   obtain the required information (for example, dynamic configuration
   can override statically configured information).  Based on these
   considerations, the framework defines different rules for obtaining
   and presenting the information for each profile type.  Additionally,
   when more than one information source is possible for the
   information, it is presented as well.  This is highlighted in the
   following sub-sections.

5.1.1.1.  SIP SUBSCRIBE for the Local-Network profile type

   Before attempting to create a SIP SUBSCRIBE requesting the local-
   network profile, the device MUST have established local network
   connectivity.  It MUST also have knowledge of the local network
   domain either via static configuration or dynamic discovery via
   DHCPv4 ([RFC2131]) or DHCPv6 ([RFC3315]).  The following requirements
   apply:
   o  the user part of the Request URI MUST NOT be provided.  The host
      and port part of the Request URI MUST be set to the concatenation
      of "sipuaconfig" and the local network domain
   o  a user AOR, if known to the device MUST be used to populate the
      "From" field, unless privacy requirements prohibit its use (this
      is useful if the user has privileges in the local network beyond
      those of the default user)
   o  if a user AOR is not known, the user portion of the "From" field
      MUST be set to "anonymous"; the host and port portion of the
      Request URI MUST be set to the concatenation of "sipuaconfig" and
      the local network domain
   o  the "device-id" event header parameter MUST be set to the device
      identifier that the device will use to request the device profile

   For example: If the device requested and received the local domain
   name via DHCP to be: airport.example.net, then the Local-Network
   Profile SUBSCRIBE Request URI would look like:

   sip:sipuaconfig.airport.example.net

   The Event header would look like the following if the device decided
   to provide MAC%3a00DF1E004CD0@airport.example.net as the device
   identifier.  (Alice may have a prior arrangement with the local
   network operator giving her special privileges.)


   Event: ua-profile;profile-type=local-network;
          device-id="sip:MAC%3a00DF1E004CD0@airport.example.net"


   The local-network profile SUBSCRIBE Request URI does not have a user
   part so that the URI is distinct between the "local" and "device"



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   URIs when the domain is the same for the two.  This provides a means
   of routing to the appropriate PDS in domains where they are distinct
   servers.

   The From field is populated with the user AOR, if available.  This
   allows the local network provider to propagate user-specific profile
   data, if available.  The "device-id" event header parameter is set to
   the device identifier.  Even though every device may get the same (or
   similar) Local-Network Profile, the uniqueness of the "device-id"
   event header provides an important capability.  Having unique From
   fields allows the management of the local network to track devices
   present in the network and consequently also manage resources such as
   bandwidth and port allocation.

5.1.1.2.  SIP SUBSCRIBE for the Device Profile Type

   The device profile type allows the Service Provider managing a device
   to provide device-specific configuration information.  To enable
   this, the Request URI needs to identify the device and the PDS domain
   within which it is recognizable.  Accordingly, this Framework
   presents the following requirements for the formation of a
   Subscription Request URI to request the "device" profile type

   o  the user portion of the Request URI MUST be set to a unique device
      Identifier
   o  the host and port portion of the Request URI MUST be set to the
      PDS domain

   The following sub-sections explain identification of - and the
   requirements related to - the device Identifier and the PDS domain
   discovery.


5.1.1.2.1.  Device Identifier

   The device profile could be specific to each device in a SIP
   deployment (for example, vendor/model) or shared across device types
   (for example, based on services and service tiers).  Further, the
   same device might be provided different configuration profiles based
   on deployment models.  Device Identifiers play a significant role in
   ensuring delivery of the correct profile and hence need to be unique
   within a PDS domain to support the various deployment models.

   This Framework requires that device Identifiers MUST be unique and
   persistent over the lifetime of a device.  Device Identifier
   representations auto-generated by devices SHOULD be based on MAC
   address or UUID ([RFC4122]) based representations.  A device may use
   alternate device identifiers (for example, SIP URIs) obtained via



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   pre-configuration or dynamic configuration (for example, device
   profile).

   If a MAC address is used, the following requirements apply:
   o  the device identifier MUST be formatted as the characters "MAC:"
      followed by a twelve digit hexadecimal upper case representation
      of the MAC address to form a proper URN ([RFC2141]).  The MAC
      address representation MUST NOT include visual separators such as
      colons and whitespaces.  The representation is denoted using the
      following ABNF syntax


         mac-ident = MAC ":" 12UHEX
         MAC       = %x4d.41.43      ; MAC in caps
         UHEX      = DIGIT / %x41-46 ; uppercase A-F


   o  the MAC address MUST only be used to represent a single device.
      It MUST NOT be used if more than one device can potentially use
      the same MAC Address (for example, multiple software entities on a
      single platform).  In such cases, the UUID representation SHOULD
      be used

   If a UUID is used, the following requirements MUST apply:
   o  the same approach to defining a user agent Instance ID as
      [RFC4122] MUST be used
   o  when the URN is used as the user part of the URI, it MUST be URL
      escaped
         The colon (":") is not a legal character (without being
         escaped) in the user part of an addr-spec ([RFC4122]).
         For example the instance ID:
         urn:uuid:f81d4fae-7ced-11d0-a765-00a0c91e6bf6@example.com
         would be escaped to look as follows in a URI:
         sip:urn%3auuid%3af81d4fae-7ced-11d0-a765-00a0c91e6bf6@
         example.com
      The ABNF for the UUID representation is provided in [RFC4122]

5.1.1.2.2.  PDS Domain Discovery

   A device needs to identify the PDS domain to form the host and port
   part of the Request URI.  Ideally, this information should be
   obtained via a single method.  However, support for various
   deployment models implies multiple device environments (for example,
   residential routers, enterprise LANs, WLAN hotspots and dialup modem)
   and presents hurdles to specifying a single method (for example, if a
   device is always in the SIP Service Provider's network one could use
   DHCP).  To accommodate multiple deployment scenarios, the framework
   specified in this document presents multiple approaches.



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   Devices MUST follow the procedures specified below in the order
   presented, unless exceptions are made by device manufacturers or
   Device Providers who may provide an option for the user to choose the
   order (to suit specific deployment models, for example).

   1. Service Provider pre-configuration

      The device MAY be pre-configured with information that can be
      utilized to identify the host and port of the Request URI.  The
      information can be provided - as examples - when the device is
      manufactured, by using Service Provider entities (flash card, SIM
      card) or via a Service Provider specific method (for example,
      information or methods that lead to self subscription).  If the
      device is specified to utilize this approach, it MUST attempt to
      do so before trying other methods.  The details of how this is
      accomplished are beyond the scope of this document.

   2. IP Configuration

      If pre-configuration is not an option, or not available, IP
      configuration MUST be utilized to try and obtain information that
      can help with identification of the host and port for the Request
      URI.  The framework defines the following methods within this
      procedure to accomplish this. device MUST follow the methods
      defined, in the order specified, i.e. if the first option cannot
      be accomplished or results in a failure, then next method is
      tried.  Failure of a specific method is indicated when the device
      cannot successfully complete Profile Enrollment.


      2a. DHCP option for SIP server:

         Devices that support DHCP MUST attempt to obtain the host and
         port of the outbound proxy during the DHCP process, using the
         DHCP option for SIP servers defined in [RFC3361] or [RFC3319]
         (for IPv4 and IPv6 respectively), and use these as the host and
         port part of the request URI.

         For example, a MAC based device identifier with a DHCP SIP
         servers option indicating example.com, the Request URI would be
         constructed as sip:MAC%3aABC123EFD456@example.com

      2b. Local IP Network Domain:

         - devices that support DHCP MUST attempt to obtain the local IP
         network domain during the DHCP process, using DHCP option 15
         and use these as the host and port part of the request URI
         using the technique specificed in [RFC3263]



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         +  For example, a MAC based devices identifier with a DHCP
            option 15 indicating local.example.com, the Request URI
            would be constructed as
            sip:MAC%3aABC123EFD456@local.example.com

         - If the local IP network domain is available (previous
         method), but the usage of the local IP Network domain results
         in a failure, the device MUST use the local IP network domain,
         prefixing it using the label "sipuaconfig."

         +  For example, a MAC based device Identifier with a DHCP
            option 15 indicating local.example.com, the Request URI
            would be constructed as
            sip:MAC%3aABC123EFD456@sipuaconfig.local.example.com


   3. Manual

      If pre-configuration and IP Configuration are not options or
      result in failures, the device SHOULD provide a means for the user
      to present information that may help with the retrieval process.
      Exceptions to this requirement MAY include devices with no user
      interface appropriate for such entry.

      This framework provides the following alternatives which can be
      considered individually or together, in any order.

      Device Provider PDS information:  The user SHOULD be allowed to
         present the host and port information which can help with the
         creation of the Subscription URI to locate a PDS capable of
         providing the profile.

      Device Provider Configuration Server information  The user MAY be
         allowed to present information pertaining to a configuration
         server that provides the device profile, not using a PDS as
         defined in this framework.  This framework specifies one such
         possible process in Section 5.5.1.

5.1.1.3.  SIP SUBSCRIBE for the User Profile Type

   The user profile allows the responsible SIP Service Provider to
   provide user-specific configuration.  This is based on the user's
   identity that is usually known in the network (for example,
   associated with a subscription).  Similar to the profiles provided to
   devices, the content and propagation of user Profiles may partake
   differently, based on deployment scenarios (for example, users
   belonging to the same subscription might - or might not - be provided
   the same profile).  However, each user is uniquely identified in a



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   SIP Service Provider's network using an Address Of Record (AOR).
   Devices implementing this framework MUST use the user's AOR to
   populate the Request URI.

   A device MAY obtain the user's AOR using various methods such as pre-
   configuration, via the device profile or dynamically via a user
   Interface.

5.1.1.4.  Caching of SIP Subscription URIs

   Creation of Subscription URIs is vital for successful Profile
   Enrollment.  Unlike the user Profile - Local-Network and device
   profiles are expected to be requested based on discovered information
   (for example, domain name discovered via DHCP).  These profile types
   have different goals and hence, caching of the Subscription URI
   should be carefully considered.

   The Local-Network profile type is aimed at obtaining information from
   the local network.  The local network can change across device
   initializations (for example, user moves the device from a home
   network to a workplace LAN).  Thus, the device SHOULD NOT remember
   local-network profile subscription URIs across initializations.  The
   device SHOULD re-create the Subscription URI every time it moves to a
   new network or gets re-initialized.  Exceptions may be cases where
   the device can unambiguously determine changes to the local network.

   The device profile type is aimed at obtaining information from the
   SIP Service Provider managing the device.  Once established, the
   Service Provider does not change often (an example of an exception
   would be the re-use of devices across Service Providers).  However,
   if the discovery process is used, the device can only be sure of
   having reached the Service Provider upon successful Profile
   Enrollment and Profile Notification.  Thus, the device SHOULD cache
   the Subscription URI for the device profile.  When cached, the device
   should use the cached Subscription URI upon a reset.  Exceptions
   include cases where the device identifier has changed (for example,
   new network card with a new MAC address), Service Provider
   information has changed (for example, user initiates change) or the
   device cannot obtain its profile using the Subscription URI.

      Devices SHOULD NOT cache the Subscription URI for the device
      profile type until successful Profile Notification.  The reason
      for this is that a PDS may send 202 responses to SUBSCRIBE
      requests and NOTIFY responses to unknown devices (see Section 6.6)
      with no profile data or URIs.  Thus, successful Profile
      Notification is the only sure way to know that the Subscription
      URI is valid.




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5.1.2.  Profile Enrollment Request Transmission

   A device requesting a profile type specified in this document - and
   is successful in forming a Subscription URI - MUST enroll using the
   event package defined, and as specified, in this framework (see
   Section 6) .  The following requirements apply:

   o  the device MUST cater to the Event Package requirements specified
      in Section 6.2 (for example, indicate the profile type being
      requested in the profile-type parameter)
   o  the device MUST use the Subscription URI pertaining to the profile
      type being requested, as specified in Section 5.1

   The SIP infrastructure receiving such requests is expected to relay
   and process profile enrollment requests.  When a Profile Enrollment
   request is received by a PDS, it SHOULD accept and respond to any
   profile requests.  Exceptions are when Service Provider policy
   prevents such a response (for example, requesting entity is unknown).

   Successful Profile Enrollment involves the following
   o  Acceptance of the SUBSCRIBE request by a PDS (indicated via a 200
      response)
   o  Receipt of an initial Profile Notification within the timeouts as
      specified in [RFC3265]


   A device SHOULD follow suitable BackOff and Retry mechanisms if a
   successful Profile Enrollment does not happen within the expected
   period.

5.1.3.  Profile Enrollment Notification

   Successful Profile Enrollment is indicated by an enrollment
   notification.  This provides either a) the profile contents b)
   content indirection information.  If content indirection information
   is provided, the device retrieves the profile using Profile Content
   Retrieval.  If the profile contents are provided, the following
   requirements hold good:

   o  the device MUST make the new profiles effective within the
      specified timeframe, as described in Section 6.2
   o  the device SHOULD cache (i.e. store persistently) the contents of
      retrieved profiles, until overridden by subsequent Profile Change
      Notifications (this avoids situations where a PDS is unavailable,
      leaving the device without required configuration)

   Failure to receive the initial NOTIFY following a successful
   enrollment MUST be treated the same as a failed enrollment.  In such



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   a scenario, the device MUST retry using alternate methods for
   creation of the enrollment subscription and transmit an enrollment
   request.  If all the enrollment subscription creation have been
   exhausted, the device MUST treat it as a failure to obtain the
   profile and take appropriate measures.

   For NOTIFY content please refer to Section 6.5.


5.2.  Profile Content Retrieval

   Upon successful Profile Enrollment, the device can retrieve the
   documents pertaining to the requested profile directly or via the
   URI(s) provided in the NOTIFY request as specified in Section 6.5.
   Profile Content Retrieval protocols and frameworks are out of scope
   for this specification.

5.3.  Profile Change Operation

   Configuration Profiles can change over time.  Modifications can be
   initiated by various entities (for example, via the device, back-
   office components and end-user web interfaces for configuration
   servers) and for various reasons (such as, change in user
   preferences, modifications to services, enterprise-imposed common
   features or restrictions).  This framework allows for such changes to
   be communicated to the PDS, using the term Profile Change Operation.

   Any changes to a Profile as a result of Profile Change Operation MUST
   result in a Profile Notification to all enrolled devices for that
   Profile, if any.

   Definition of specific mechanisms for Profile Change Operation are
   out of scope of this document.

5.4.  Profile Change Notification

   Whenever a profile is changed, a PDS compliant with this framework
   MUST NOTIFY all the devices currently subscribed to the profile under
   consideration.  This process is termed Profile Change Notification.

   For NOTIFY content please refer to Section 6.5.


5.5.  Additional Considerations

   This section provides a special case for retrieval of the device
   profile and highlights considerations and requirements on external
   entities such as Profile Data Frameworks.



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5.5.1.  Manual retrieval of the Device Profile

   At a minimum, a device requires the device profile to be able to
   function effectively.  However, the methods specified in this
   document may fail to provide a device with a profile.  To illustrate
   with an example, consider the case of a device that finds itself
   behind a local network which does not provide information about DNS
   servers in the network (for example, misconfigured home network).  In
   such cases, it would be beneficial to employ an alternative means to
   obtain the profile information (for example, resolvable DNS Servers
   could be part of the device profile).  While this specification
   recommends that such a method be made available, it also specifies
   one such option using HTTP that is described in this sub-section.
   devices expected to encounter scenarios where propogation of the
   device profile can be hindered may employ the specified - or any
   alternative - process.

   The method being described involves the device to utilize a HTTPS URI
   (and any required credentials) based on either pre-configuration or
   manual entry by the user (in cases where such an interface is
   possible).  This can lead to the retrieval of the device profile
   which may contain the properties for the SUBSCRIBE Request URI and
   credentials for Profile Enrollment and Profile Notification.  This
   approach bootstraps the process in a different step in the cycle, but
   uses the same framework.

   Further, this document defines a new HTTP request header "Event".
   The syntax of the HTTP Event header is the same as the SIP Event
   header defined in this document.  Similar to the SIP Event header the
   purpose of the HTTP Event header is to define the content of the
   state information to be retrieved.  In particular, the state
   information is the device, user or local-network profile for the
   device.  The SIP Event header parameters for this event package
   ("profile-type", "vendor", "model", "version") are also mandatory for
   the HTTP Event header as they are used to provide information as to
   what profile type is requested along with information about the
   device which may impact the contents of the profile.  When the device
   starts with retrieval of the profile via HTTPS (instead of a SIP
   SUBSCRIBE to the event package), the device MUST provide the Event
   header defined.


5.5.2.  Device Types

   The examples in this framework tend to associate devices with
   entities that are accessible to end-users.  However, this is not
   necessarily the only type of device that can utilize the specified
   Framework. devices can be entities such as user Interfaces (that



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   allow for device Configuration), entities in the network that do not
   directly communicate with any users (for example, Service Provider
   deployed gateways) or elements in the Service Provider's network (for
   example, SIP servers).

5.5.3.  Profile Data

   This framework does not specify the contents for any profile type.
   Follow-on standardization activities can address profile contents.
   However, it makes the following assumptions and recommendations:

   o  When the device receives multiple profiles, the contents of each
      profile type will only contain data relevant to the entity it
      represents.  As an example, consider a device that obtains all the
      defined profiles.  Information pertaining to the local network is
      contained in the 'local-network' profile and not the'user'
      profile.  This does not preclude relevant data about a different
      entity from being included in a profile type, for example, the
      'device' profile type may contain information about the users
      allowed to access services via the device.  A profile may also
      contain starting information to obtain subsequent Profiles
   o  Data overlap SHOULD be avoided across profile types, unless
      necessary.  If data overlap is present, prioritization of the data
      is left to data definitions.  As an example, the device profile
      may contain the list of codecs to be used by the device and the
      user Profile (for a user on the device) may contain the codecs
      preferred by the user.  Thus, the same data (usable codecs) is
      present in two profiles.  However, the data definitions may
      indicate that to function effectively, any codec chosen for
      communication needs to be present in both the profiles.

5.5.4.  Profile Data Frameworks

   This framework specified in this document does not address profile
   data representation, storage or retrieval protocols.  It assumes that
   the PDS has a PCC based on existing or other Profile Data Frameworks,
   for example, XCAP ([I-D.ietf-simple-xcap]).

   While it does not impose vast constraints on any such framework, it
   does allow for the propagation of profile content to PDS
   (specifically the PCC).  Thus, Profile Data or Retrieval frameworks
   used in conjunction with this framework MAY consider techniques for
   propagating incremental, atomic changes to the PDS.  For example, a
   means for propagating changes to a PDS is defined in XCAP
   ([I-D.ietf-simple-xcap]).






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5.5.5.  Additional Profile Types

   This document specifies three profile types: local-network, device
   and user.  However, there may be use cases for additional profile
   types.  For example, profile types for application specific profile
   data.  Definition of such additional profile types is not prohibited,
   but considered out of scope for this document.

5.5.6.  Deployment considerations

   The framework defined in this document was designed to address
   various deployment considerations, some of which are highlighted
   below.

   Provider relationships:
   o  The local network provider and the SIP service provider can often
      be different entities, with no administrative or business
      relationship with each other;
   o  There may be multiple SIP service providers involved, one for each
      service that a user subscribes to (telephony service, instant
      messaging, etc.); this Framework does not specify explicit
      behavior in such a scenario, but it does not prohibit its usage
      either
   o  Each user accessing services via the same device may subscribe to
      different sets of services, from different Service Providers;

   User-device relationship:
   o  The relationship between devices and users can be many-to-many
      (for example, a particular device may allow for many users to
      obtain subscription services through it, and individual users may
      have access to multiple devices);
   o  Each user may have different preferences for use of services, and
      presentation of those services in the device user interface;
   o  Each user may have different personal information applicable to
      use of the device, either as related to particular services, or
      independent of them.


6.  Event Package Definition

   The framework specified in this document proposes and specifies a new
   SIP Event Package as allowed by [RFC3265].  The purpose is to allow
   for devices to subscribe to specific profile types with PDSs and for
   the PDSs to notify the devices with - or pointers to - profile data.

   The requirements specified in [RFC3265] apply to this package.  The
   following sub-sections specify the Event Package description and the
   associated requirements.  The framework requirements are defined in



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   Section 5.


6.1.  Event Package Name

   The name of this package is "ua-profile".  This value appears in the
   Event header field present in SUBSCRIBE and NOTIFY requests for this
   package as defined in [RFC3265].

6.2.  Event Package Parameters

   This package defines the following new parameters for the event
   header:
      "profile-type", "vendor", "model", "version", "effective-by",
      "device-id" and "network-user".
   The following rules apply:
   o  All the new parameters, with the exception of the "effective-by"
      parameter MUST only be used in SUBSCRIBE requests and ignored if
      they appear in NOTIFY requests
   o  The "effective-by" parameter is for use in NOTIFY requests only
      and MUST be ignored if it appears in SUBSCRIBE requests
   The semantics of these new parameters are specified in the following
   sub-sections.


6.2.1.  profile-type

   The "profile-type" parameter is used to indicate the token name of
   the profile type the user agent wishes to obtain data or URIs for and
   to be notified of subsequent changes.  This document defines three
   logical types of profiles and their token names.  They are as
   follows:

   local-network  Specifying "local-network" type profile indicates the
      desire for profile data (URI when content indirection is used)
      specific to the local network.
   device  Specifying "device" type profile(s) indicates the desire for
      the profile data (URI when content indirection is used) and change
      notification of the contents of the profile that is specific to
      the device or user agent.
   user  Specifying "user" type profile indicates the desire for the
      profile data (URI when content indirection is used) and change
      notification of the profile content for the user.
   The "profile-type" is identified is identified in the Event header
   parameter: profile-type.  A separate SUBSCRIBE dialog is used for
   each profile type.  The profile type associated with the dialog can
   then be used to infer which profile type changed and is contained in
   the NOTIFY or content indirection URI.  The Accept header of the



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   SUBSCRIBE request MUST include the MIME types for all profile content
   types for which the subscribing user agent wishes to retrieve
   profiles or receive change notifications.

   In the following syntax definition using ABNF, EQUAL and token are
   defined in [RFC3261].  It is to be noted that additional profile
   types may be defined in subsequent documents.


   Profile-type   = "profile-type" EQUAL profile-value
   profile-value  =  profile-types / token
   profile-types  = "device" / "user" / "local-network"

   The "device", "user" or "local-network" token in the profile-type
   parameter may represent a class or set of profile properties.
   Follow-on standards defining specific profile contents may find it
   desirable to define additional tokens for the profile-type parameter.
   Also additional content types may be defined along with the profile
   formats that can be used in the Accept header of the SUBSCRIBE to
   filter or indicate what data sets of the profile are desired.


6.2.2.  vendor, model and version

   The "vendor", "model" and "version" parameter values are tokens
   specified by the implementer of the user agent.  These parameters
   MUST be provided in the SUBSCRIBE request for all profile types.  The
   implementer SHOULD use their DNS domain name (for example,
   example.com) as the value of the "vendor" parameter so that it is
   known to be unique.  These parameters are useful to the PDS to affect
   the profiles provided.  In some scenarios it is desirable to provide
   different profiles based upon these parameters.  For example, feature
   property X in a profile may work differently on two versions of the
   same user agent.  This gives the PDS the ability to compensate for or
   take advantage of the differences.  In the following ABNF defining
   the syntax, EQUAL and quoted-string are defined in [RFC3261].


   Vendor       =  "vendor" EQUAL quoted-string
   Model        =  "model" EQUAL quoted-string
   Version      =  "version" EQUAL quoted-string


6.2.3.  device-id

   The "device-id" parameter MUST be set when subscribing for "local-
   network" profiles.  This identifies the device requesting the local-
   network profile.



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   If the value of the "profile-type" parameter is not "local-network",
   the "device-id" parameter has no defined meaning and is ignored.  In
   the following ABNF, EQUAL, LDQUOT, RDQUOT and addr-spec are defined
   in [RFC3261].

   Device-Id =  "device-id" EQUAL LDQUOT addr-spec RDQUOT

6.2.4.  network-user

   The "network-user" parameter MAY be provided in a subscription for a
   "device" profile.  In such cases the device is requesting the PDS to
   recognize the indicated user as the default user for itself.

   If the value of the "profile-type" parameter is not "device", the
   "network-user" parameter has no defined meaning and is ignored.  If
   the "network-user" parameter is provided in the SUBSCRIBE request, it
   MUST be present in the NOTIFY request as well.  In the following
   ABNF, EQUAL, LDQUOT, RDQUOT and addr-spec are defined in [RFC3261].

   Network-User =  "network-user" EQUAL LDQUOT addr-spec RDQUOT

6.2.5.  effective-by parameter

   The "effective-by" parameter in the Event header of the NOTIFY
   request specifies the maximum number of seconds before the user agent
   must attempt to make the new profile effective.  The "effective-by"
   parameter MAY be provided in the NOTIFY request for any of the
   profile types.  A value of 0 (zero) indicates that the subscribing
   user agent must attempt to make the profiles effective immediately
   (despite possible service interruptions).  This gives the PDS the
   power to control when the profile is effective.  This may be
   important to resolve an emergency problem or disable a user agent
   immediately.  The "effective-by" parameter is ignored in all messages
   other than the NOTIFY request.  In the following ABNF, EQUAL and
   DIGIT are defined in [RFC3261].

   Effective-By =  "effective-by" EQUAL 1*DIGIT

6.2.6.  Summary of event parameters

   The following are example Event headers which may occur in SUBSCRIBE
   requests.  These examples are not intended to be complete SUBSCRIBE
   requests.

   Event: ua-profile;profile-type=device;
          vendor="vendor.example.com";model="Z100";version="1.2.3"

   Event: ua-profile;profile-type="user";



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          vendor="premier.example.com";model="trs8000";version="5.5"

   The following are example Event headers which may occur in NOTIFY
   requests.  These example headers are not intended to be complete
   SUBSCRIBE requests.

   Event: ua-profile;effective-by=0

   Event: ua-profile;effective-by=3600

   The following table shows the use of Event header parameters in
   SUBSCRIBE requests for the three profile types:

   profile-type || device | user | local-network
   =============================================
   vendor       ||   m    |  m   |        m
   model        ||   m    |  m   |        m
   version      ||   m    |  m   |        m
   device-id    ||        |      |        m
   network-user ||   o    |      |
   effective-by ||        |      |

   m - mandatory
   s - SHOULD be provided
   o - optional

   Non-specified means that the parameter has no meaning and should be
   ignored.

   The following table shows the use of Event header parameters in
   NOTIFY requests for the three profile types:

   profile-type || device | user | local-network
   =============================================
   vendor       ||        |      |
   model        ||        |      |
   version      ||        |      |
   device-id    ||        |      |        o
   network-user ||   o    |      |
   effective-by ||   o    |  o   |        o

6.3.  SUBSCRIBE Bodies

   This package defines no use of the SUBSCRIBE request body.  If
   present, it MUST be ignored.

   Future enhancements to the framework may specify a use for the
   SUBSCRIBE request body (for example,, mechanisms using etags to



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   minimize Profile Notifications to devices with current profile
   versions).

6.4.  Subscription Duration

   The duration of a subscription is specific to SIP deployments and no
   specific recommendation is made by this Event Package.  If absent, a
   value of 86400 seconds is RECOMMENDED since the presence (or absence)
   of a device subscription is not time critical to the regular
   functioning of the PDS.

   It is to be noted that a one-time fetch of a profile can be
   accomplished by setting the 'Expires' parameter to a value of Zero,
   as specified in [RFC3265].

6.5.  NOTIFY Bodies

   The framework specifying the Event Package allows for the NOTIFY body
   to contain the profile data or a pointer to the profile data using
   content indirection.  The framework does not define any profile data
   and delegates specification of utilized MIME types Profile Data
   Frameworks.  For profile data delivered via content indirection, the
   following apply:

   o  the Content-ID MIME header, as described in [RFC4483] MUST be used
      for each Profile document URI
   o  at a minimum, the "http:" and "https:" URI schemes MUST be
      supported; other URI schemas MAY be supported based on the Profile
      Data Frameworks (examples include FTP [RFC0959], HTTP [RFC2616],
      HTTPS [RFC2818], LDAP [RFC4510], XCAP [I-D.ietf-simple-xcap],
      XCAP-DIFF [I-D.ietf-simple-xcap-diff])

   The NOTIFY body SHOULD include a MIME type specified in the 'Accept'
   header of the SUBSCRIBE.  Further, if the Accept header of the
   SUBSCRIBE included the MIME type message/external-body (indicating
   support for content indirection) the content indirection SHOULD be
   used in the NOTIFY body for providing the profiles.  If none are
   specified, the Profile Data frameworks are responsible for, and MUST
   specify, the MIME type to be assumed.


6.6.  Notifier Processing of SUBSCRIBE Requests

   A successful SUBSCRIBE request results in a NOTIFY with either
   profile contents or a pointer to it (via Content Indirection).  If
   the NOTIFY is expected to contain profile contents or the Notifier is
   unsure, the SUBSCRIBE SHOULD be either authenticated or transmitted
   over an integrity protected SIP communication channels.  Exceptions



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   to authenticating such SUBSCRIBEs include cases where the identity of
   the Subscriber is unknown and the Notifier is configured to accept
   such requests.

   The Notifier MAY also authenticate SUBSCRIBE messages even if the
   NOTIFY is expected to only contain a pointer to profile data.
   Securing data sent via Content Indirection is covered in Section 9.

   If the profile type indicated in the "profile-type" Event header
   parameter is unavailable or the Notifier is configured not to provide
   it, the Notifier SHOULD return a 404 response to the SUBSCRIBE
   request.  If the specific user or device is unknown, the Notifier MAY
   either accept or reject the subscription.

   When the Event header "profile-type" is "device" and the user agent
   has provided the user's AOR in the "network-user" parameter, the
   profile delivery server MAY set or change the default user associated
   with the device indicated in the Subscription request.  However, the
   Notifier SHOULD authenticate the user indicated before making such a
   change.

6.7.  Notifier Generation of NOTIFY Requests

   As specified in [RFC3265], the Notifier MUST always send a NOTIFY
   request upon accepting a subscription.  If the device or user is
   unknown and the Notifier choose to accept the subscription, the
   Notifier MAY either respond with profile data (for example, default
   profile data) or provide no profile information (i.e. no body or
   content indirection).

   If the URI in the SUBSCRIBE request is a known identity and the
   requested profile information is available (i.e. as specified in the
   profile-type parameter of the Event header), the Notifier SHOULD send
   a NOTIFY with profile data.  Profile data MAY be sent as profile
   contents or via Content Indirection (if the content indirection MIME
   type was included in the Accept header).  To allow for Content
   Indirection, the Subscriber MUST support the "http:" or "https:" URI
   schemas.  If the Subscriber wishes to support alternative URI schemas
   it MUST be indicated in the "schemes" Contact header field parameter
   as defined in [RFC4483].  If the subscriber does not specify the URI
   scheme, the Notifier may use either "http:" or "https:".

   The Notifier MAY specify when the new profiles must be made effective
   by the Subscriber by specifying a maximum time in seconds (zero or
   more) in the "effective-by" event header parameter.

   If the SUBSCRIBE was received over an integrity protected SIP
   communications channel, the Notifier SHOULD send the NOTIFY over the



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   same channel.

6.8.  Subscriber Processing of NOTIFY Requests

   A Subscriber to this event package MUST adhere to the NOTIFY request
   processing behavior specified in [RFC3265].  If the Notifier
   indicated an effective time (using the "effective-by" Event Header
   parameter), it SHOULD attempt to make the profiles effective within
   the specified time.  Exceptions include deployments that prohibit
   such behavior in certain cases (for example, emergency sessions are
   in progress).  When profile data cannot be applied within the
   recommended timeframe and this affects device behavior, any actions
   to be taken SHOULD be defined by the profile data definitions.  By
   default, the Subscriber is RECOMMENDED to make the profiles effective
   as soon as possible.

   The Subscriber MUST always support "http:" or "https:" and be
   prepared to accept NOTIFY messages with those URI schemas.The
   subscriber MUST also be prepared to receive a NOTIFY request with no
   body.  The subscriber MUST NOT reject the NOTIFY request with no
   body.  The subscription dialog MUST NOT be terminated by a NOTIFY
   with no body.


6.9.  Handling of Forked Requests

   This Event package allows the creation of only one dialog as a result
   of an initial SUBSCRIBE request as described in section 4.4.9 of
   [RFC3265].  It does not support the creation of multiple
   subscriptions using forked SUBSCRIBE requests.

6.10.  Rate of Notifications

   The rate of notifications for the profiles in this framework is
   deployment specific, but expected to be infrequent.  Hence, the Event
   Package specification does not specify a throttling or minimum period
   between NOTIFY requests

6.11.  State Agents

   State agents are not applicable to this Event Package.


7.  Examples

   This section provides examples along with sample SIP message bodies
   relevant to this framework.  Both the examples are derived from a
   snapshot of Section 4.1, specifically the request for the device



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   profile.  The examples are purely informative and in case of
   conflicts with the framework or protocols used for illustration, the
   latter should be deemed normative.


7.1.  Example 1: Device requesting profile

   This example illustrates the detailed message flows between the
   device and the SIP Service Provider's network for requesting and
   retrieving the profile (the flow uses the device profile as an
   example).

   The following are assumed for this example:

   o  Device is assumed to have established local network connectivity;
      NAT and Firewall considerations are assumed to have been addressed
      by the SIP Service Provider
   o  examples are a snapshot only and do not illustrate all the
      interactions between the device and the Service Provider's network
      (and none between the entities in the SIP Service Provider's
      network)
   o  All SIP communication with the SIP Service Provider happens via a
      SIP Proxy
   o  HTTP is assumed to be the Profile Data method used (any suitable
      alternative can be used as well)
   o  TLS is assumed to be the protocol for securing the Profile Content
      Retrieval (any other suitable protocol can be employed);
      authentication and security requirements are not addressed

   The flow diagram and an explanation of the messages follow.





















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                                      +----------------------+
    +--------+                        | SIP Service Provider |
    | Device |                        |                      |
    |(SIP UA)|                        |  SIP     PDS   HTTP  |
    +--------+                        | PROXY         Server |
                                      |                      |
                                      +----------------------+
         |                                |       |      |
         |                                |       |      |
         |          SUBSCRIBE             |       |      |
   (SReq)|--------device profile--------->|       |      |
         |                                |------>|      |
         |                                |200 OK |      |
         |            200 OK              |<------|      |
   (SRes)|<-------------------------------|       |      |
         |                                |       |      |
         |                                | NOTIFY|      |
         |    NOTIFY (Content Indirection)|<------|      |
   (NTFY)|<-------------------------------|       |      |
         |            200 OK              |       |      |
   (NRes)|------------------------------->|200 OK |      |
         |                                |------>|      |
         |                                               |
         |                                               |
         |                                               |
         |<<<<<<<<<<<<<  TLS establishment  >>>>>>>>>>>>>|
         |                                               |
         |                HTTP Request                   |
   (XReq)|---------------------------------------------->|
         |                                               |
         |                HTTP Response                  |
   (XRes)|<----------------------------------------------|
         |                                               |




   (SReq)

      the device transmits a request for the 'device' profile using the
      SIP SUBSCRIBE utilizing the Event Package specified in this
      framework.

      *    Note: Some of the header fields (for example, Event, via) are
           continued on a separate line due to format constraints of
           this document





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   SUBSCRIBE sip:MAC%3a000000000000@sip.example.net SIP/2.0
   Event: ua-profile;profile-type=device;vendor="vendor.example.net";
    model="Z100";version="1.2.3";network-user="sip:user@sip.example.net"
   From: sip:MAC%3A000000000000@sip.example.net;tag=1234
   To: sip:MAC%3A000000000000@sip.example.net
   Call-ID: 3573853342923422@192.0.2.44
   CSeq: 2131 SUBSCRIBE
   Contact: sip:MAC%3A000000000000@sip.example.net
   Via: SIP/2.0/TCP 192.0.2.41;
     branch=z9hG4bK6d6d35b6e2a203104d97211a3d18f57a
   Accept: message/external-body, application/x-z100-device-profile
   Content-Length: 0




   (SRes)

      the SUBSCRIBE request is received by a SIP Proxy in the Service
      Provider's network which transmits it to the PDS.  The PDS accepts
      the response and responds with a 200 OK
      *    Note: The device and the SIP proxy may have established a
           secure communications channel (for example, TLS)

   (NTFY)

      subsequently, the PDS transmits a SIP NOTIFY message indicating
      the profile location
      *  Note: Some of the fields (for example, content-type) are
         continued on a separate line due to format constraints of this
         document




















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   NOTIFY sip:MAC%3A000000000000@192.0.2.44 SIP/2.0
   Event: ua-profile;effective-by=3600
   From: sip:MAC%3A000000000000@sip.example.net;tag=abca
   To: sip:MAC%3A000000000000@sip.example.net;tag=1231
   Call-ID: 3573853342923422@192.0.2.44
   CSeq: 322 NOTIFY
   Via: SIP/2.0/UDP 192.0.2.3;
     branch=z9hG4bK1e3effada91dc37fd5a0c95cbf6767d0
   MIME-Version: 1.0
   Content-Type: message/external-body; access-type="URL";
                 expiration="Mon, 01 Jan 2010 09:00:00 UTC";
                 URL="http://sip.example.net/z100-000000000000.html";
                 size=9999;
                 hash=10AB568E91245681AC1B

   Content-Type: application/x-z100-device-profile
   Content-ID: <39EHF78SA@sip.example.net>
   .
   .
   .




   (NRes)

      Device accepts the NOTIFY message and responds with a 200 OK

   (XReq)

      once the necessary secure communications channel is established,
      the device sends an HTTP request to the HTTP server indicated in
      the NOTIFY

   (XRes)

      the HTTP server responds to the request via a HTTP response
      containing the profile contents


7.2.  Example 2: Device obtaining change notification

   The following example illustrates the case where a user (X) is
   simultaneously accessing services via two different devices (for
   example, Multimedia entities on a PC and PDA) and has access to a
   user Interface (UI) that allows for changes to the user profile.

   The following are assumed for this example:



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   o  The devices (A & B) obtain the necessary profiles from the same
      SIP Service Provider
   o  The SIP Service Provider also provides a user Interface (UI) that
      allows the user to change preferences that impact the user profile

   The flow diagram and an explanation of the messages follow.
   o  Note: The example only shows retrieval of user X's profile, but it
      may request and retrieve other profiles (for example, local-
      network, Device).




               -----           -----
              |User |_________| UI* | * = User Interface
              |  X  |         |     |
               -----           -----
             /       \
            /         \
           /           \              +----------------------+
    +--------+      +--------+        | SIP Service Provider |
    | Device |      | Device |        |                      |
    |    A   |      |    B   |        |  SIP     PDS   HTTP  |
    +--------+      +--------+        | PROXY         Server |
                                      +----------------------+
         |                                |       |      |
         |                                |       |      |
   (A-EX)|<=Enrolls for User X's profile=>|<=====>|      |
         |                                |       |      |
         |                                               |
   (A-RX)|<===Retrieves User X's profile================>|
         |                                               |
         |               |                |       |      |
         |               |  Enrolls for   |       |      |
         |         (B-EX)|<== User X's ==>|<=====>|      |
         |               |    profile     |       |      |
         |               |                |       |      |
         |               |                               |
         |         (B-RX)|<= Retrieves User X's profile=>|
         |                                               |
         |                       |                       |
         |                 (HPut)|---------------------->|
         |                       |                       |
         |                 (HRes)|<----------------------|
         |                                               |
         |                                |       |      |
         |                                | NOTIFY|      |
         |            NOTIFY              |<------|      |



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   (A-NT)|<-------------------------------|       |      |
         |            200 OK              |       |      |
   (A-RS)|------------------------------->|200 OK |      |
         |                                |------>|      |
         |                                               |
         |               |                | NOTIFY|      |
         |               |    NOTIFY      |<------|      |
         |         (B-NT)|<---------------|       |      |
         |               |    200 OK      |       |      |
         |         (B-RS)|--------------->|200 OK |      |
         |               |                |------>|      |
         |                                               |
         |                                               |
   (A-RX)|<===Retrieves User X's profile================>|
         |                                               |
         |               |                               |
         |               |                               |
         |         (B-RX)|<= Retrieves User X's profile=>|
         |               |                               |





   (A-EX)  Device A discovers, enrolls and obtains notification related
      to user X's profile
   (A-RX)  Device A retrieves user X's profile
   (B-EX)  Device B discovers, enrolls and obtains notification related
      to user X's profile
   (B-RX)  Device B retrieves user X's profile
   (HPut)  Changes affected by the user via the user Interface (UI) are
      uploaded to the HTTP Server
      *  Note: The UI itself can act as a device and subscribe to user
         X's profile.  This is not the case in the example shown.
   (HRes)  Changes are accepted by the HTTP server
   (A-NT)  PDS transmits a NOTIFY message to device A indicating the
      changed profile.  A sample message is shown below:
         Note: Some of the fields (for example, Via) are continued on a
         separate line due to format constraints of this document












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   NOTIFY sip:userX@192.0.2.44 SIP/2.0
   Event: ua-profile;effective-by=3600
   From: sip:userX@sip.example.net;tag=abcd
   To: sip:userX@sip.example.net.net;tag=1234
   Call-ID: 3573853342923422@192.0.2.44
   CSeq: 322 NOTIFY
   Via: SIP/2.0/UDP 192.0.2.3;
     branch=z9hG4bK1e3effada91dc37fd5a0c95cbf6767d1
   MIME-Version: 1.0
   Content-Type: message/external-body; access-type="URL";
                 expiration="Mon, 01 Jan 2010 09:00:00 UTC";
                 URL="http://www.example.com/user-x-profile.html";
                 size=9999;
                 hash=123456789AAABBBCCCDD
   .
   .
   .




   (A-RS)  Device A accepts the NOTIFY and sends a 200 OK
   (B-NT)  PDS transmits a NOTIFY message to device B indicating the
      changed profile.  A sample message is shown below:
         Note: Some of the fields (for example, Via) are continued on a
         separate line due to format constraints of this document


   NOTIFY sip:userX@192.0.2.43 SIP/2.0
   Event: ua-profile;effective-by=3600
   From: sip:userX@sip.example.net;tag=abce
   To: sip:userX@sip.example.net.net;tag=1235
   Call-ID: 3573853342923422@192.0.2.43
   CSeq: 322 NOTIFY
   Via: SIP/2.0/UDP 192.0.2.3;
     branch=z9hG4bK1e3effada91dc37fd5a0c95cbf6767d2
   MIME-Version: 1.0
   Content-Type: message/external-body; access-type="URL";
                 expiration="Mon, 01 Jan 2010 09:00:00 UTC";
                 URL="http://www.example.com/user-x-profile.html";
                 size=9999;
                 hash=123456789AAABBBCCCDD
   .
   .
   .






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   (B-RS)  Device B accepts the NOTIFY and sends a 200 OK
   (A-RX)  Device A retrieves the updated profile pertaining to user X
   (B-RX)  Device B retrieves the updated profile pertaining to user X


8.  IANA Considerations

   There are two IANA considerations associated with this document, SIP
   Event Package and HTTP header.  These are outlined in this section.

8.1.  SIP Event Package

   This specification registers a new event package as defined in
   [RFC3265].  The following information required for this registration:

      Package Name: ua-profile
      Package or Template-Package: This is a package
      Published Document: RFC XXXX (Note to RFC Editor: Please fill in
      XXXX with the RFC number of this specification).
      Persons to Contact: Daniel Petrie dan.ietf AT SIPez DOT com,
      sumanth@cablelabs.com
      New event header parameters: profile-type, vendor, model, version,
      effective-by, device-id, network-user (the profile-type parameter
      has predefined values.  The new event header parameters do not)
   The following table illustrates the additions to the IANA SIP Header
   Field Parameters and Parameter Values: (Note to RFC Editor: Please
   fill in XXXX with the RFC number of this specification)

                                                  Predefined
   Header Field                  Parameter Name     Values     Reference
   ----------------------------  ---------------   ---------   ---------
   Event                         profile-type      Yes         [RFCXXXX]
   Event                         vendor            No          [RFCXXXX]
   Event                         model             No          [RFCXXXX]
   Event                         version           No          [RFCXXXX]
   Event                         effective-by      No          [RFCXXXX]
   Event                         device-id         No          [RFCXXXX]
   Event                         network-user      No          [RFCXXXX]

8.2.  New HTTP Event Header

   This document defines a new permanent HTTP request header field:
   Event.
      Header field name: Event
      Applicable protocol: http
      Status: standard





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      Author/Change controller: IETF
      Specification document(s): [RFCXXXX] (Note to RFC Editor: Please
      fill in XXXX with the RFC number of this specification).


9.  Security Considerations

   The framework specified in this document allows for the propagation
   of device profile data (Section 5.5.3).  To accomplish this, it
   specifies a Profile Life Cycle (Section 3.3) and an Event Package
   (Section 6).

   The Profile Life Cycle consists of three distinct communication
   channels: Profile Enrollment and Change Notification, Profile Content
   Retrieval, and Profile Change Operation.




































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       +------+                 +-----+
       |      |                 |     |
       |Device|                 | PNC |
       |      |                 |     |
       +------+                 +-----+
           |                       |
           |  Profile Enrollment   |
           |---------------------->|
           |                       |
           |  Profile Notification | (initial
           |<----------------------|  or upon
           |                       |  a change)


       +------+                 +-----+
       |      |                 |     |
       |Device|                 | PCC |
       |      |                 |     |
       +------+                 +-----+
           |                       |
           |    Profile Request    |  (When content
           |---------------------->|   indirection
           |                       |   is used)
           |    Profile Response   |
           |<----------------------|
           |                       |


   +------------+                        +-----+
   | Authorized |                        | PCC |
   |   Entity   |                        |     |
   +------------+                        +-----+
        |                                   |
        |                                   |
        |      Profile Change Request       |
        |---------------------------------->|
        |                                   |
        |      Profile Change Response      |
        |<----------------------------------|
        |                                   |



         PNC = Profile Notification Component
         PCC = Profile Content Component






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                         Framework Reference Model

   Profile enrollment and change notification allows a device to
   transmit a request for a specific profile - relayed directly, or via
   one or more SIP proxies - to a PNC.  If the PNC accepts the profile
   request, it transmits a Profile Notification that contains either:
   profile data or content indirection information.  The profile data
   can contain information specific to an entity (such as the device or
   a user) and may contain sensitive information (such as service
   credentials).  Compromise of such data can lead to threats such as
   impersonation attacks (establishing rogue sessions), theft of service
   (if services are obtainable), and zombie attacks.  Even if the
   profile data is provided using content indirection, PCC information
   within the notification can lead to threats such as denial of service
   attacks (rogue devices bombard the PCC with requests for a specific
   profile) and attempts to modify erroneous data onto the PCC (since
   the location and format may be known).  It is also important for the
   device to ensure the authenticity of the PNC since impersonation of
   the Service Provider can lead to Denial of Service, Man-in-the-Middle
   attacks, etc.

   Profile Content retrieval allows a device to retrieve profile data
   from a PCC.  This communication is accomplished using one of many
   profile delivery protocols or frameworks, but is considered to be out
   of scope within this document.  However, since the profile data
   returned is subject to the same considerations as that sent via
   profile notification, the same threats exist.

   Profile Change Operation allows an authorized entity to modify
   profiles stored on a PCC.  The specific entities are based on Service
   Provider's policy and can include trusted network elements and
   devices alike.  The profile information stored on a PCC can contain
   information that directs device and user behavior, services offered
   and may contain sensitive information such as credentials.  Thus,
   allowing entities that are not trusted to perform profile
   modifications presents threats such as denial-of-service,
   manipulation of service, impersonation (for example, redirection to
   rogue networks) and man-in-the-middle attacks.

   The framework specified in this document accomplishes the propagation
   of profile data by utilizing the specified "ua-profile" event package
   which is based on [RFC3265].  Thus, its usage is expected to comply
   with the security considerations and requirements (access control,
   Notifier privacy mechanism, Denial-of-Service attacks, replay
   attacks, and Man-in-the Middle attacks) specified in Section 5 of
   [RFC3265].  The remainder of this section presents the specific
   security requirements for the framework.




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9.1.  Profile Enrollment and Change Notification

   This framework specifies, and allows for the propagation of, three
   profile types: local-network, device and user.  Enrollment and change
   notification are expected to be accomplished over integrity-protected
   SIP communication channels and following requirements are presented:

   o  devices and PNCs complying with this framework MUST implement TLS
      as specified in [RFC3268], including support for both mutual and
      one-way authentication (server-side)

   o  devices and PNCs complying with this framework MUST implement the
      SIP Digest authentication scheme as specified in [RFC3261]

   o  a PNC capable of propagating device and user profiles MUST contain
      a X.509 certificate.  This certificate MUST contain the PNC's
      Fully Qualified Domain Name in the 'SubjectAltName', establishing
      the PNC as a host in the Service Provider's domain

   o  a PNC capable of propagating local-network profiles or
      unauthenticated device profiles MUST support the use of the SIP
      Identity header as defined in [RFC4474] for inclusion in profile
      notifications

   Each profile type serves a different purpose, and is provided under
   different circumstances and thus presents slightly different
   requirements for authentication and protection of communication.

   local-network profile

      The local-network profile is provided by the local network and
      usually contains non-sensitive data that is shared among all
      participants in a local network.  However, the framework also
      allows for the presentation of the user's AOR, if known, for
      possible privileged user data.  This may, or may not, result in
      user-specific information.

      The following requirements are presented:
      *  the PNC MUST authenticate the identity of the user (if set to
         anything other than the default) for local-network profile
         requests that result in user-specific profile data containing
         sensitive information; for authentication, unless other
         mechanisms are employed, SIP Digest is used.  If the
         authentication fails, the PNC MUST not include any user-
         specific information in the local-network profile
      *  the PNC MAY NOT authenticate requests for the local-network
         profile that do not result in any user-specific sensitive data
         (irrespective of the value of the From field)



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      *  the PNC MUST include the SIP Identity header as defined in
         [RFC4474] within profile notifications sent in response to
         local-network profile enrollment, unless an integrity-protected
         channel exists (for example, using S/MIME)
      *  a device receiving profile notifications for local-network
         profiles MUST verify the SIP Identity header, unless
         transmitted over a previously established authenticated,
         integrity-protected channel.  If the header verification fails,
         the device MUST not use the provided profile and treat it as a
         local-network profile enrollment failure and take measures such
         as enrollment retries

   device profile

      The device profile is expected to contain data specific to the
      device identity (AOR) being presented in the request.  The
      presented identity may be auto-generated (for example, based on
      its hardware identity as allowed in section Section 5.1.1.2.1) or
      obtained via configuration.  This identity and associated
      credentials have the following considerations:
      *  credentials can be provided via out-of-band mechanisms such as
         pre-configuration or user interface
      *  credentials may not be present, but obtained via the initial
         device profile, if allowed by the Service Provider
      *  device may use the user's AOR and associated credentials for
         obtaining the device profile

      If the AOR presented in device profile enrollment is known by the
      PNC, the following requirements are presented:
      *  the PNC MUST authenticate the AOR presented for enrollment
         using SIP Digest authentication, unless a previously
         established mutually authenticated channel exists (for example,
         using TLS).  If the authentication fails, the PNC MUST not
         provide the requested device-specific profile.  In such a
         scenario, the PNC MAY still provide a generic device profile
         for minimal services (for example, emergency calls in a
         telephony deployment, see [I-D.ietf-ecrit-phonebcp])
      *  if the profile data is provided in the enrollment notificaiton,
         the PNC MUST transmit it over an integrity-protected,
         confidential communications channel such as TLS

      If the AOR presented in device profile enrollment is not known by
      the PNC, the following requirements are presented:
      *  the PNC MUST not provide any sensitive information in the
         profile data
      *  the device MUST transmit the request over an integrity-
         protected SIP communications channel.  If none exists, the
         device MUST establish a TLS connection with the PNC and verify



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         the PNC's certificate.  If the PNC authentication fails or a
         secure communications channel cannot be established, the device
         MUST treat it as a device profile enrollment failure and take
         measures such as retry enrollment

   user profile

      The user profile is expected to contain data specific to the user
      identity (AOR) being presented in the request.  This identity is
      expected to be known in the network and associated with
      credentials.  Thus, the following requirements are presented:
      *  the device MUST transmit the request over an integrity-
         protected SIP communications channel.  If none exists, the
         device MUST establish a TLS connection with the PNC and verify
         the PNC's certificate.  If the PNC authentication fails or a
         secure communications channel cannot be established, the device
         MUST treat this as a user profile enrollment failure and take
         measures such as retry enrollment
      *  the PNC MUST authenticate the AOR presented for enrollment
         using SIP Digest authentication, unless a previously
         established mutually authenticated channel exists (for example,
         using TLS).  If the user authentication fails, the PNC MUST not
         provide the requested user-specific information.  It MAY
         provide minimal profile information (such as connection to a
         customer support webpage)
      *  if the profile data is provided in the enrollment notificaiton,
         the PNC MUST transmit it over an integrity-protected,
         confidential communications channel such as TLS


9.2.  Profile Content Retrieval

   This framework does not mandate specific profile delivery frameworks,
   but presents security requirements for profile content retrieval
   using content indirection.  Given the nature of the profiles, the
   requirements are as follows:
   o  devices and PCCs compliant with this framework MUST implement HTTP
      Digest authentication as specified in [RFC2617]; this is used
      whenever an authentication challenge is initiated using HTTP based
      protocols specified for interoperability
   o  a PCC complying with this framework MUST implement HTTPS
      [RFC2818]; this is used when there are no existing integrity-
      protected communication channels
   o  a PCC complying with this framework MUST contain a X.509
      certificate.  This certificate MUST contain the PNC's Fully
      Qualified Domain Name in the 'SubjectAltName', establishing the
      PNC as a host in the Service Provider's domain




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   The following general requirement applies to all profile types:
   o  a device MUST request profile content retrieval over an integrity
      protected channel such as HTTPS.  If one does not exist or cannot
      be established, then the device MUST treat this as a profile
      content retrieval failure and take measures such as profile
      content retrieval retries or in the case of retry exhaustion, try
      enrollment

   The following profile-specific usage requirements are presented

   local-network profile

      *  a PCC MUST challenge a profile content retrieval request if the
         profile data contains user-specific information; this challenge
         is against a user's AOR, known by the PCC and the device
      *  a PCC MAY challenge a profile content retrieval request even if
         the profile data contains user-specific information; this
         challenge is against a user's AOR, if provided

   device profile
      *  a PCC MUST authenticate a profile content retrieval request if
         the AOR presented is known.  If the authentication fails, the
         PCC MUST not provide device-specific information.  In such a
         scenario, the PCC MAY still provide a generic device profile
         for minimal services (for example, emergency calls in a
         telephony deployment, see [I-D.ietf-ecrit-phonebcp])

   user profile
      *  a PCC MUST authenticate a profile content retrieval request.
         If the user authentication fails, the PNC MUST not provide the
         requested user-specific information.  It MAY provide minimal
         profile information (such as connection to a customer support
         webpage)

9.3.  Profile Change Operation

   Changes to profiles will only be made by authorized entities and
   requires mutual authentication.  The following requirements are
   presented:
   o  a PCC complying with this framework MUST contain a X.509
      certificate.  This certificate MUST contain the PNC's Fully
      Qualified Domain Name in the 'SubjectAltName', establishing the
      PNC as a host in the Service Provider's domain.  This may be the
      same, or different, from the certificate used for profile content
      retrieval
   o  an entity that is allowed to make updates MUST contain a AOR that
      is known to the network and the requirements for making changes
      are the same as that for user profile content retrieval, with the



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      authorized entity playing the role of a user


10.  Acknowledgements

   Many thanks to those who contributed and commented on the many
   iterations of this document.  Detailed comments were provided by the
   following individuals: Jonathan Rosenberg from Cisco, Henning
   Schulzrinne from Columbia University, Cullen Jennings from Cisco,
   Rohan Mahy from Plantronics, Rich Schaaf from Pingtel, Volker Hilt
   from Bell Labs, Adam Roach of Estacado Systems, Hisham Khartabil from
   Telio, Henry Sinnreich from MCI, Martin Dolly from AT&T Labs, John
   Elwell from Siemens, Elliot Eichen and Robert Liao from Verizon, Dale
   Worley from Pingtel, Francois Audet from Nortel, Roni Even from
   Polycom, Jason Fischl from Counterpath, Josh Littlefield from Cisco,
   Nhut Nguyen from Samsung.

   The editor would like to extend a special thanks to the experts who
   contributed to the restructuring and revisions as proposed by the
   SIPPING WG, specifically Keith Drage from Lucent (restructuring
   proposal), Peter Blatherwick from Mitel (who also contributed to the
   Overview and Introduction sections), Josh Littlefield from Cisco
   (examples and diagram suggestions), Alvin Jiang of Engin, Martin
   Dolly from AT&T, Jason Fischl from Counterpath, Donald Lukacs from
   Telcordia and Eugene Nechamkin from Broadcom.  Additionally, sincere
   appreciation is extended to the chairs (Mary Barnes from Nortel and
   Gonzalo Camarillo from Ericsson) and the Area Directors (Cullen
   Jennings from Cisco and Jon Peterson and Cisco) for facilitating
   discussions, and for reviews and contributions.


11.  Change History

   [[RFC Editor: Please remove this entire section upon publication as
   an RFC.]]

11.1.  Changes from draft-ietf-sipping-config-framework-10.txt

   The following are the changes that have been incorporated into this
   I-D, resulting from the design team discussions based on Working
   Group feedback.
   o  Modified the "From" header of the local network profile to reflect
      the user's AOR, if any; delegated the device identifier to a new
      event header termed "device-id"; removed use for 'network-user'
      within the local-network profile; if there are objections to this,
      please educate us!





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   o  Added text to indicate DHCPv4 or DHCPv6 to accomodate IPv4 and
      IPv6 environments
   o  Replaced generic 'Service Provider' with terms to better represent
      scenarios
   o  Analyzed the current SHOULD v/s MUST requirements for the Profile
      Framework and made modifications
   o  Referenced RFC4122 instead of OUTBOUND
   o  Simplified the introductory sections to better illustrate
      potential deployment possibilities; indicated the minimum profile
      supported to be 'device'
   o  Revamped the security considerations sections

11.2.  Changes from draft-ietf-sipping-config-framework-09.txt

   Following the ad-hoc SIPPING WG discussions at IETF#67 and as per the
   email from Gonzalo Camarillo dated 12/07/2006, Sumanth was appointed
   as the new editor.  This sub-section highlights the changes made by
   the editor (as per expert recommendations from the SIPPING WG folks
   interested in this effort) and the author.


   Changes incorporated by the editor:
   o  Document was restructured based on a) Keith's recommendations in
      the email dated 11/09/2006 and responses (Peter, Sumanth, Josh) b)
      subsequent discussions by the ad-hoc group consisting of the
      editor, the author, expert contributors (Peter Blatherwick, Josh
      Littlefield, Alvin Jiang, Jason Fischl, Martin Dolly, Cullen
      Jennings) and the co-chairs .  Further changes follow.
   o  Use cases were made high-level with detailed examples added later
      on
   o  Several sections were modified as part of the restructuring (for
      example, Overview, Introduction, Framework Requirements, Security
      Sections)
   o  General editorial updates were made


   Changes incorporated by the author:

   o  Incorporated numerous edits and corrections from CableLabs review.
   o  Used better ascii art picture of overview from Josh Littlefield
   o  Fixed the normative text for network-user so that it is now
      consistant: MAY provide for device profile, MUST provide for
      local-network profile.

11.3.  Changes from draft-ietf-sipping-config-framework-08.txt






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      The Request URI for profile-type=localnet now SHOULD not have a
      user part to make routing easier.  The From field SHOULD now
      contain the device id so that device tracking can still be done.
      Described the concept of profile-type as a filter and added
      normative text requiring 404 for profile types not provided.
      Moved "application" profile type to
      draft-ietf-sipping-xcap-config-01.  The "application" value for
      the profile-type parameter will also be used as a requirement that
      XCAP be supported.
      Fixed text on certificate validation.
      Added new HTTP header: Event to IANA section and clean up the IANA
      section.
      Added diagram for Service Provider use case schenario.
      Added clarification for HTTP Event header.
      Added clarification of subscriber handling of NOTIFY with no body.

11.4.  Changes from draft-ietf-sipping-config-framework-07.txt

      Made XCAP informative reference.  Removed "document" and "auid"
      event header parameters, and Usage of XCAP section to be put in
      separate supplementary draft.
      Fixed ABNF for device-id to be addr-spec only (not name-addr) and
      to be quoted as well.
      Synchronized with XCAP path terminology.  Removed XCAP path
      definition as it is already defined in XCAP.
      User agent instance ID is now defined in output (not GRUU).
      Clarified the rational for the device-id parameter.
      Added text to suggest URIs for To and From fields.
      Clarified use of device-id parameter.
      Allow the use of the auid and document parameters per request by
      the OMA.

11.5.  Changes from draft-ietf-sipping-config-framework-06.txt

      Restructured the introduction and overview section to be more
      consistent with other Internet-Drafts.
      Added additional clarification for the Digest Authentication and
      Certificate based authentication cases in the security section.
      Added two use case scenarios with cross referencing to better
      illustrate how the framework works.  Added better cross
      referencing in the overview section to help readers find where
      concepts and functionality is defined in the document.
      Clarified the section on the use of XCAP.  Changed the Event
      parameter "App-Id" to "auid".  Made "auid" mutually exclusive to
      "document". "auid" is now only used with XCAP.
      Local network subscription URI changed to <device-id>@
      <local-network> (was anonymous@<local-network>).  Having a
      different Request URI for each device allows the network



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      management to track user agents and potentially manage bandwidth,
      port allocation, etc.
      Changed event package name from sip-profile to ua-profile per
      discussion on the list and last IETF meeting.
      Changed "local" profile type token to "local-network" per
      discussion on the list and last IETF meeting.
      Simplified "Vendor", "Model", "Version" event header parameters to
      allow only quoted string values (previously allowed token as
      well).
      Clarified use of the term cache.
      Added references for ABNF constructs.
      Numerous editorial changes.  Thanks Dale!

11.6.  Changes from draft-ietf-sipping-config-framework-05.txt

      Made HTTP and HTTPS profile transport schemes mandatory in the
      profile delivery server.  The subscribing device must implement
      HTTP or HTTPS as the profile transport scheme.
      Rewrote the security considerations section.
      Divided references into Normative and Informative.
      Minor edits throughout.

11.7.  Changes from draft-ietf-sipping-config-framework-04.txt

      Clarified usage of instance-id
      Specify which event header parameters are mandatory or optional
      and in which messages.
      Included complete list of event header parameters in parameter
      overview and IANA sections.
      Removed TFTP reference as protocol for profile transport.
      Added examples for discovery.
      Added ABNF for all event header parameters.
      Changed profile-name parameter back to profile-type.  This was
      changed to profile-name in 02 when the parameter could contain
      either a token or a path.  Now that the path is contained in the
      separate parameter: "document", profile-type make more sense as
      the parameter name.
      Fixed some statements that should have and should not have been
      normative.
      Added the ability for the user agent to request that the default
      user associated with the device be set/changed using the
      "device-id" parameter.
      A bunch of editorial nits and fixes.

11.8.  Changes from draft-ietf-sipping-config-framework-03.txt

   Incorporated changes to better support the requirements for the use
   of this event package with XCAP and SIMPLE so that we can have one



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   package (i.e. simple-xcap-diff now defines a content type not a
   package).  Added an additional profile type: "application".  Added
   document and app-id Event header parameters in support of the
   application profile.  Define a loose high level data model or
   relationship between the four profile types.  Tried to edit and fix
   the confusing and ambiguous sections related to URI formation and
   discovery for the different profile types.  Better describe the
   importance of uniqueness for the instance id which is used in the
   user part of the device URI.

11.9.  Changes from draft-ietf-sipping-config-framework-02.txt

   Added the concept of the local network as a source of profile data.
   There are now three separate logical sources for profile data: user,
   device and local network.  Each of these requires a separate
   subscription to obtain.

11.10.  Changes from draft-ietf-sipping-config-framework-01.txt

   Changed the name of the profile-type event parameter to profile-name.
   Also allow the profile-name parameter to be either a token or an
   explicit URI.

   Allow content indirection to be optional.  Clarified the use of the
   Accept header to indicate how the profile is to be delivered.

   Added some content to the Iana section.

11.11.  Changes from draft-ietf-sipping-config-framework-00.txt

   This version of the document was entirely restructured and re-written
   from the previous version as it had been micro edited too much.

   All of the aspects of defining the event package are now organized in
   one section and is believed to be complete and up to date with
   [RFC3265].

   The URI used to subscribe to the event package is now either the user
   or device address or record.

   The user agent information (vendor, model, MAC and serial number) are
   now provided as event header parameters.

   Added a mechanism to force profile changes to be make effective by
   the user agent in a specified maximum period of time.

   Changed the name of the event package from sip-config to ua-profile




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   Three high level security approaches are now specified.

11.12.  Changes from draft-petrie-sipping-config-framework-00.txt

   Changed name to reflect SIPPING work group item

   Synchronized with changes to SIP DHCP [RFC3361], SIP [RFC3261] and
   [RFC3263], SIP Events [RFC3265] and content indirection [RFC4483]

   Moved the device identity parameters from the From field parameters
   to user-agent header parameters.

   Many thanks to Rich Schaaf of Pingtel, Cullen Jennings of Cisco and
   Adam Roach of Estacado Systems for the great comments and input.

11.13.  Changes from draft-petrie-sip-config-framework-01.txt

   Changed the name as this belongs in the SIPPING work group.

   Minor edits

11.14.  Changes from draft-petrie-sip-config-framework-00.txt

   Split the enrollment into a single SUBSCRIBE dialog for each profile.
   The 00 draft sent a single SUBSCRIBE listing all of the desired.
   These have been split so that each enrollment can be routed
   differently.  As there is a concept of device specific and user
   specific profiles, these may also be managed on separate servers.
   For instance in a nomadic situation the device might get its profile
   data from a local server which knows the LAN specific profile data.
   At the same time the user specific profiles might come from the
   user's home environment profile delivery server.

   Removed the Config-Expires header as it is largely superfluous with
   the SUBSCRIBE Expires header.

   Eliminated some of the complexity in the discovery mechanism.

   Suggest caching information discovered about a profile delivery
   server to avoid an avalanche problem when a whole building full of
   devices powers up.

   Added the user-profile From header field parameter so that the device
   can request a user specific profile for a user that is different from
   the device's default user.


12.  References



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12.1.  Normative References

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

   [RFC2616]  Fielding, R., Gettys, J., Mogul, J., Frystyk, H.,
              Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext
              Transfer Protocol -- HTTP/1.1", RFC 2616, June 1999.

   [RFC2617]  Franks, J., Hallam-Baker, P., Hostetler, J., Lawrence, S.,
              Leach, P., Luotonen, A., and L. Stewart, "HTTP
              Authentication: Basic and Digest Access Authentication",
              RFC 2617, June 1999.

   [RFC2818]  Rescorla, E., "HTTP Over TLS", RFC 2818, May 2000.

   [RFC3261]  Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston,
              A., Peterson, J., Sparks, R., Handley, M., and E.
              Schooler, "SIP: Session Initiation Protocol", RFC 3261,
              June 2002.

   [RFC3263]  Rosenberg, J. and H. Schulzrinne, "Session Initiation
              Protocol (SIP): Locating SIP Servers", RFC 3263,
              June 2002.

   [RFC3265]  Roach, A., "Session Initiation Protocol (SIP)-Specific
              Event Notification", RFC 3265, June 2002.

   [RFC3268]  Chown, P., "Advanced Encryption Standard (AES)
              Ciphersuites for Transport Layer Security (TLS)",
              RFC 3268, June 2002.

   [RFC3315]  Droms, R., Bound, J., Volz, B., Lemon, T., Perkins, C.,
              and M. Carney, "Dynamic Host Configuration Protocol for
              IPv6 (DHCPv6)", RFC 3315, July 2003.

   [RFC3319]  Schulzrinne, H. and B. Volz, "Dynamic Host Configuration
              Protocol (DHCPv6) Options for Session Initiation Protocol
              (SIP) Servers", RFC 3319, July 2003.

   [RFC3361]  Schulzrinne, H., "Dynamic Host Configuration Protocol
              (DHCP-for-IPv4) Option for Session Initiation Protocol
              (SIP) Servers", RFC 3361, August 2002.

   [RFC4122]  Leach, P., Mealling, M., and R. Salz, "A Universally
              Unique IDentifier (UUID) URN Namespace", RFC 4122,
              July 2005.




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   [RFC4474]  Peterson, J. and C. Jennings, "Enhancements for
              Authenticated Identity Management in the Session
              Initiation Protocol (SIP)", RFC 4474, August 2006.

   [RFC4483]  Burger, E., "A Mechanism for Content Indirection in
              Session Initiation Protocol (SIP) Messages", RFC 4483,
              May 2006.

12.2.  Informative References

   [I-D.ietf-ecrit-phonebcp]
              Rosen, B. and J. Polk, "Best Current Practice for
              Communications Services in support of Emergency  Calling",
              draft-ietf-ecrit-phonebcp-00 (work in progress),
              October 2006.

   [I-D.ietf-simple-xcap]
              Rosenberg, J., "The Extensible Markup Language (XML)
              Configuration Access Protocol (XCAP)",
              draft-ietf-simple-xcap-12 (work in progress),
              October 2006.

   [I-D.ietf-simple-xcap-diff]
              Rosenberg, J., "An Extensible Markup Language (XML)
              Document Format for Indicating A Change  in XML
              Configuration Access Protocol (XCAP) Resources",
              draft-ietf-simple-xcap-diff-04 (work in progress),
              October 2006.

   [RFC0959]  Postel, J. and J. Reynolds, "File Transfer Protocol",
              STD 9, RFC 959, October 1985.

   [RFC2131]  Droms, R., "Dynamic Host Configuration Protocol",
              RFC 2131, March 1997.

   [RFC2141]  Moats, R., "URN Syntax", RFC 2141, May 1997.

   [RFC4510]  Zeilenga, K., "Lightweight Directory Access Protocol
              (LDAP): Technical Specification Road Map", RFC 4510,
              June 2006.











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Authors' Addresses

   Daniel Petrie
   SIPez LLC.
   34 Robbins Rd
   Arlington, MA  02476
   USA

   Email: dan.ietf AT SIPez DOT com
   URI:   http://www.SIPez.com/


   Sumanth Channabasappa (Editor)
   CableLabs
   858 Coal Creek Circle
   Louisville, Co  80027
   USA

   Email: sumanth@cablelabs.com
   URI:   http://www.cablelabs.com/































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