One document matched: draft-ietf-sip-uri-list-subscribe-01.txt
Differences from draft-ietf-sip-uri-list-subscribe-00.txt
SIPPING Working Group G. Camarillo
Internet-Draft Ericsson
Updates: 3265 (if approved) A. Roach
Expires: July 30, 2007 Estacado Systems
O. Levin
Microsoft Corporation
January 26, 2007
Subscriptions to Request-Contained Resource Lists in the Session
Initiation Protocol (SIP)
draft-ietf-sip-uri-list-subscribe-01.txt
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Copyright Notice
Copyright (C) The IETF Trust (2007).
Abstract
This document specifies a way to create subscription to a list of
resources in SIP. This is achieved by including the list of
resources in the body of a SUBSCRIBE request. Instead of having a
subscriber send a SUBSCRIBE request for each resource individually,
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the subscriber defines the resource list, subscribes to it, and gets
notifications about changes in the resources' state using a single
SUBSCRIBE dialog.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. User Agent Client Procedures . . . . . . . . . . . . . . . . . 3
3.1. Response Handling . . . . . . . . . . . . . . . . . . . . 3
3.2. Subsequent SUBSCRIBE Requests . . . . . . . . . . . . . . 4
4. URI-List Document Format . . . . . . . . . . . . . . . . . . . 4
5. Resource List Server Behavior . . . . . . . . . . . . . . . . 5
5.1. Subsequent SUBSCRIBE Requests . . . . . . . . . . . . . . 5
6. Providing a URI to Manipulate a Resource List . . . . . . . . 5
7. Example . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
8. Security Considerations . . . . . . . . . . . . . . . . . . . 7
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
9.1. List-management Purpose Parameter Value . . . . . . . . . 8
9.2. Recipient-list-subscribe Option-Tag . . . . . . . . . . . 8
10. Acknowledges . . . . . . . . . . . . . . . . . . . . . . . . . 8
11. Normative References . . . . . . . . . . . . . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 9
Intellectual Property and Copyright Statements . . . . . . . . . . 10
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1. Introduction
RFC 4662 [4] specifies how to establish subscriptions to a
homogeneous resource list in SIP (which is specified in RFC 3261 [2])
and defines the procedures for getting notifications about changes in
the state of the associated resources. Yet, list creation is outside
the scope of RFC 4662 [4].
This document specifies a way to create a list with a set of
resources and subscribe to it using a single SIP request. This is
achieved by including the list of resources (as defined in RFC xxxx
[5]) in the body of the SUBSCRIBE request.
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 [1].
3. User Agent Client Procedures
A UAC (User Agent Client) that wants to create a resource list and
subscribe to it using the mechanism described in this document,
constructs a SUBSCRIBE request with at least one body, whose
disposition is type "recipient-list" as defined in RFC xxxx [5],
containing the URI-list. Additionally, the UAC MUST include the
'recipient-list-subscribe' option-tag, which is registered with the
IANA in Section 9, in a Require header field. The UAC MUST build the
remaining of the SUBSCRIBE request following the rules in RFC 3265
[3].
The UAC MUST support the "rlmi+xml" format defined in RFC 4662 [4]
and signal this by including "rlmi+xml" in the Accept header. The
UAC MAY support additional formats and include them in the Accept
header field of the SUBSCRIBE request.
3.1. Response Handling
The status code in the response to the SUBSCRIBE request does not
provide any information about whether or not the resource list server
was able to successfully subscribe to the URIs in the URI-list. The
UAC obtains this information in the notifications sent by the server.
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3.2. Subsequent SUBSCRIBE Requests
The previous sections have specified how to include a URI-list in an
initial SUBSCRIBE request to a resource list server in order to
subscribe to the state of a set of resources. Once the subscription
has been created and a dialog between the UAC and the resource list
server has been established, the UAC can send subsequent SUBSCRIBE
requests to, for example, extend the duration of the subscription.
At this point, there are no semantics associated with resource-list
bodies in subsequent SUBSCRIBE requests (although future extensions
can define them). Therefore, UACs SHOULD NOT include resource-list
bodies in subsequent SUBSCRIBE requests to a resource list server.
Note that a difference between an initial SUBSCRIBE request and
subsequent ones is that while the initial request is sent to the
public URI of the resource list, subsequent ones are sent to the
URI provided by the server when the dialog was established.
Therefore, from the UAC's point of view, the resource identified
by the former URI supports recipient-list bodies while the
resource identified by the latter does not support them.
4. URI-List Document Format
RFC xxxx [5] mandates that each URI-list services specification, such
as the subscription service defined here, specifies the default
format for the recipient-list bodies used within the particular
service.
The default format for the recipient-list bodies for the subscription
service defined in this document is the resource list format defined
in RFC xxxx [6]. UAs (User Agents) generating recipient-list bodies
MUST support this format and MAY support other formats. Resource
list servers able to handle recipient-list bodies MUST support this
format and MAY support other formats.
The Extensible Markup Language (XML) Configuration Access Protocol
(XCAP) resource list document provides features, such as hierarchical
lists and the ability to include entries by reference relative to the
XCAP root URI, that are not needed by the subscription service
defined here, which only needs to transfer a flat list of URIs
between a UA and the resource list server. Therefore, when using the
default resource list document, UAs SHOULD use flat lists (i.e., no
hierarchical lists) and SHOULD NOT use <entry-ref> elements. A
resource list server receiving a URI-list with more information than
what has just been described MAY discard all the extra information.
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Figure 1 shows an example of a flat list that follows the resource
list document.
<?xml version="1.0" encoding="UTF-8"?>
<resource-lists xmlns="urn:ietf:params:xml:ns:resource-lists"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<list>
<entry uri="sip:bill@example.com" />
<entry uri="sip:joe@example.org" />
<entry uri="sip:ted@example.net" />
</list>
</resource-lists>
Figure 1: URI-List
5. Resource List Server Behavior
Resource list servers that are able to receive and process SUBSCRIBE
requests with a recipient-list body SHOULD include a 'recipient-list-
subscribe' option-tag in a Supported header field when responding to
OPTIONS requests.
On reception of a SUBSCRIBE request with a URI-list, a resource list
server, which chooses to accept the "rlmi+xml" format, MUST comply
with RFC 4662 [4] for creating the subscription and reporting the
changes in the resources within the created dialog.
5.1. Subsequent SUBSCRIBE Requests
At this point, there are no semantics associated with resource-list
bodies in subsequent SUBSCRIBE requests (although future extensions
may define them). Therefore, a resource list server receiving a
subsequent SUBSCRIBE request with a resource-list body, following
standard SIP procedures, rejects it with a 415 (Unsupported Media
Type) response.
6. Providing a URI to Manipulate a Resource List
A UAC can manipulate a resource list at a resource list server. The
resource list server MAY provide a URI to manipulate the resource
list associated with a subscription using the Call-Info header field
in the NOTIFY request that establishes the subscription. The
"purpose" parameter of the Call-Info header field MUST have a value
of 'list-management', which we register with the IANA in Section 9.
The following is an example of such a header field.
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Call-Info: <http://xcap.example.com/your-list.xml>
;purpose=list-management
The life-time of a resource list to be manipulated by the URI
provided by the server is bundled to the life-time of the
subscription. That is, the resource list SHOULD be destroyed when
the subscription expires or is otherwise terminated.
Section 7.1 of RFC 3265 [3] does not list the Call-Info header field
in the table of header fields NOTIFY requests can carry. This
document updates that table so that the Call-Info header field can be
optionally included in NOTIFY requests.
7. Example
The following is an example of a SUBSCRIBE request, which carries a
URI-list in its body, sent by a UAC to a resource list server.
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SUBSCRIBE sip:rls@example.com SIP/2.0
Via: SIP/2.0/TCP terminal.example.com;branch=z9hG4bKwYb6QREiCL
Max-Forwards: 70
To: RLS <sip:rls@example.com>
From: <sip:adam@example.com>;tag=ie4hbb8t
Call-ID: cdB34qLToC@terminal.example.com
CSeq: 1 SUBSCRIBE
Contact: <sip:terminal.example.com>
Event: presence
Expires: 7200
Require: recipient-list-subscribe
Supported: eventlist
Accept: application/cpim-pidf+xml
Accept: application/rlmi+xml
Accept: multipart/related
Accept: multipart/signed
Accept: multipart/encrypted
Content-Type: application/resource-lists+xml
Content-Disposition: recipient-list
Content-Length: 337
<?xml version="1.0" encoding="UTF-8"?>
<resource-lists xmlns="urn:ietf:params:xml:ns:resource-lists"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<list>
<entry uri="sip:bill@example.com" />
<entry uri="sip:joe@example.org" />
<entry uri="sip:ted@example.net" />
</list>
</resource-lists>
Figure 2: SUBSCRIBE request
8. Security Considerations
The Security Considerations Section of RFC 4662 [4] discusses
security issues related to resource list servers. Resource list
servers accepting request-contained URI-lists MUST also follow the
security guidelines given in RFC 4662 [4].
The Framework and Security Considerations for SIP URI-List Services
(which is specified in RFC xxxx [5]) discusses issues related to SIP
URI-list services. Given that a resource list server sending
SUBSCRIBE requests to a set of users acts as a URI-list service,
implementations of resource list servers that handle request-
contained URI-lists MUST follow the security-related rules in RFC
xxxx [5]. These rules include mandatory authentication and
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authorization of clients, and opt-in lists.
9. IANA Considerations
The following sections request the IANA to register the 'list-
management' value for the purpose parameter of the Call-Info header
field and the 'recipient-list-subscribe' SIP option-tag.
9.1. List-management Purpose Parameter Value
This document defines the 'list-management' value for the purpose
parameter of the Call-Info header field. A reference to this RFC (in
double brackets) needs to be added to the existing purpose Call-Info
parameter entry in the SIP Parameters registry.
9.2. Recipient-list-subscribe Option-Tag
This document defines the SIP option tag "recipient-list-subscribe".
The following row shall be added to the "Option Tags" section of the
SIP Parameter Registry:
+--------------------------+------------------------------+-----------+
| Name | Description | Reference |
+--------------------------+------------------------------+-----------+
| recipient-list-subscribe | This option tag is used to | [RFCXXXX] |
| | ensure that a server can | |
| | process the 'recipient-list' | |
| | body used in a SUBSCRIBE | |
| | request. | |
+---------------------------------------------------------+-----------+
Editor Note: [RFCXXXX] should be replaced with the designation of
this document.
10. Acknowledges
Cullen Jennings and Jonathan Rosenberg provided useful comments on
this document.
11. Normative References
[1] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
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[2] 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.
[3] Roach, A., "Session Initiation Protocol (SIP)-Specific Event
Notification", RFC 3265, June 2002.
[4] Roach, A., Campbell, B., and J. Rosenberg, "A Session Initiation
Protocol (SIP) Event Notification Extension for Resource Lists",
RFC 4662, August 2006.
[5] Camarillo, G. and A. Roach, "Framework and Security
Considerations for Session Initiation Protocol (SIP) Uniform
Resource Identifier (URI)-List Services",
draft-ietf-sipping-uri-services-06 (work in progress),
September 2006.
[6] Rosenberg, J., "Extensible Markup Language (XML) Formats for
Representing Resource Lists",
draft-ietf-simple-xcap-list-usage-05 (work in progress),
February 2005.
Authors' Addresses
Gonzalo Camarillo
Ericsson
Hirsalantie 11
Jorvas 02420
Finland
Email: Gonzalo.Camarillo@ericsson.com
Adam Roach
Estacado Systems
Email: adam@estacado.net
Orit Levin
Microsoft Corporation
One Microsoft Way
Redmond, WA 98052
Email: oritl@microsoft.com
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