SIPPING WG O. Koren
Internet-Draft Comverse
Expires: July 2007 January 7, 2007
A Conference List Information Event Package for the Session
Initiation Protocol (SIP)
draft-koren-sipping-conference-list-event-00.txt
Status of this Memo
By submitting this Internet-Draft, each author represents that
any applicable patent or other IPR claims of which he or she is
aware have been or will be disclosed, and any of which he or she
becomes aware will be disclosed, in accordance with Section 6 of
BCP 79.
This document may only be posted in an Internet-Draft.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet-
Drafts.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt
The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html
This Internet-Draft will expire on July 7, 2007.
Abstract
This document describes the usage of the Session Initiation Protocol
(SIP) for subscriptions and notifications related to conference
lists.
A new conference list event package is specified. This event package
allows a user to subscribe to a single event (the conference-list)
and receive notifications that contain the list of conferences to
O. Koren Expires July 7, 2007 [Page 1]
Internet-Draft Conference List Event For SIP January 2007
which the user belongs and the status of each conference. The
notifications sent from the conference server can contain either the
entire list of the user's conferences or a partial list with the
updates since the previous notification.
Table of Contents
1. Introduction................................................2
2. Requirements Terminology....................................3
3. Usage Scenario..............................................3
4. Package Description.........................................4
4.1 Event package name.......................................4
4.2 Subscribe to conference-list event package...............5
4.3 Subscription expiration..................................5
4.4 NOTIFY Bodies............................................5
5. XML Schema..................................................7
6. Example.....................................................9
7. IANA Considerations........................................13
8. Security Considerations....................................13
9. Acknowledgements...........................................13
10. Change History.............................................14
11. References.................................................14
11.1 Normative References....................................14
11.2 Informative References..................................14
Author's Addresses...............................................14
Intellectual Property Statement..................................15
Disclaimer of Validity...........................................15
Copyright Statement..............................................15
Acknowledgment...................................................16
1. Introduction
RFC 4575 [RFC4575] defines a SIP Event Package for Conference State.
Users can subscribe to a conference Uniform Resource Identifier (URI)
and be notified about their conference information.
The draft describes a new event package that allows a user to
subscribe to a conference-list.
By subscribing to the event package, a user can receive a list of all
relevant conference URIs (via the notification).
The user can then subscribe to each individual conference URI and
receive specific conference information (according to [RFC4574]).
The user will receive updates (via notifications) whenever there is a
change to the user's conference list. Examples of such changes
O. Koren Expires July 7, 2007 [Page 2]
Internet-Draft Conference List Event For SIP January 2007
include the user joining a new conference, the user closing a
conference, etc.
2. Requirements Terminology
Keywords "MUST", "MUST NOT", "REQUIRED", "SHOULD", "SHOULD NOT" and
"MAY" that appear in this document are to be interpreted as described
in [RFC2119].
3. Usage Scenario
Users subscribe to the conference-list event package in order to
receive the most up-to-date information about their open and closed
conferences. This information can be received on any device from
which Users can subscribe. There are no restrictions regarding when a
device can subscribe to the service. Users can decide to add
additional UAs to subscribe to the event and get the most up-to-date
recent conference list status. Furthermore, users can switch between
different UAs and always get via notification the most updated
conference list, which they can then use to subscribe to a specific
conference Uniform Resource Identifier (URI) and get additional
information (according to [RFC4575]).
As an example, User A can subscribe to the conference-list event
package as follows:
SUBSCRIBE sip:A@example.com SIP/2.0
Via: SIP/2.0/UDP x12.example.com;branch=z9hG4bKy5as148
From: sip:A@example.com;tag=146sa4
To: sip:A@example.com
Call-ID: 553223@x12.example.com
Max-Forwards: 70
CSeq: 10 SUBSCRIBE
Contact: sip:A@x12.example.com
Event: conference-list
The conference server SHOULD check and authorize the subscription,
and send the notification with the most updated conference list and
status:
O. Koren Expires July 7, 2007 [Page 3]
Internet-Draft Conference List Event For SIP January 2007
NOTIFY sip:A@x12.example.co SIP/2.0
Via: SIP/2.0/UDP conference1.example.com;branch=z9hG4bKy5as148
From: sip:A@example.com;tag=151fd4
To: sip:A@example.com;tag=146sa4
Call-ID: 553223@x12.example.com
CSeq: 5 NOTIFY
Contact: sip:conference1.example.com
Event: conference-list
Subscription-State: active
Max-Forwards: 70
Content-Type: application/conference-list+xml
Content-Length:
<?xml version="1.0"?>
<conference-list xmlns="urn:ietf:params:xml:ns:conference-list"
version="1" state="full">
<conferences resource="sip:A@example.com">
<conference id="sip:conference_111@example.com" display-
name="sip:conference_111@example.com" status="active"/>
</conferences>
</conference-list>
4. Package Description
The Subscribe request with the conference-list event uses the same
header and structure as defined in [RFC3265].
4.1 Event package name
A new event package is defined (as define in [RFC3265]):
Event: conference-list
O. Koren Expires July 7, 2007 [Page 4]
Internet-Draft Conference List Event For SIP January 2007
4.2 Subscribe to conference-list event package
A user MAY subscribe from any UA to the conference-list event
package.
The new event package SHOULD NOT include any Body at the Subscription
request. All other Subscribe operations (e.g.: Refresh) are the same
as defined in [RFC3265].
Subscription authentication MUST operate to validate the Subscriber.
The Subscription authentication mechanism MAY operate as defined in
[RFC3261].
Authorization of the subscribing user in the conference server is out
of the scope of this draft.
4.3 Subscription expiration
The UA can subscribe with a defined expiration period to the
conference server. The subscribing UA MAY use the Expires header
field to determine the subscription period.
4.4 NOTIFY Bodies
The conference-list notification body is an XML document that MUST be
well formed and SHOULD be valid. The conference-list XML document
MUST be based on XML 1.0 and MUST be encoded by using UTF-8. The
notify body structure and format is described by the XML schema in
Section 5.
The notification from the conference server contains a new Content-
Type:
Content-Type: application/conference-list+xml
The XML structure below describes the new conference-list Content-
Type body:
<?xml version="1.0"?>
<conference-list xmlns="urn:ietf:params:xml:ns:conference-list"
version="1" state="full">
<conferences resource="sip:A@example.com">
O. Koren Expires July 7, 2007 [Page 5]
Internet-Draft Conference List Event For SIP January 2007
<conference id="sip:conference_111@example.com" display-
name="sip:conference_111@example.com" status="active"/>
</conferences>
</conference-list>
The conference list notification can include a full or partial list
of URIs (in the state value). In case of state="full" the entire
conference list MUST be sent from the conference server to the
subscribed User. When state="partial", part of the conference list
MUST be sent from the conference server to the subscribed user.
The partial list SHOULD reflect the delta changes from the previous
notification. The first notification to a subscribed user MUST be a
full notification.
The "version" attribute is used to determine the sequence of
notifications to the subscribed user. The conference server MUST
increases the "version" for each notification within the same
subscription.
The conference "id" describes the User's unique conference Uniform
Resource Identifier (URI). The "status" value defines the conference
status - it may be "active" or "close" (or any other status that
describes the conference state). A conference that a User joins will
have an "active" status. The status will be "close" when a User
closes an existing conference and a conference-list notification will
be sent with the updated status value. "status" MUST be sent both in
"partial" and "full" notifications.
A "full" state will include only the conferences in "active" status
while the "partial" state MAY include "active" and/or "close" status.
It is the responsibility of the UA of the subscriber to represent the
complete conference list and status to the user.
The display-name value MAY be included in the conference tag. The
display-name value MAY be a conference Uniform Resource Identifier
(URI) or other textual informative string. This information MAY be
presented on the UI or may be used for any other purposes.
O. Koren Expires July 7, 2007 [Page 6]
Internet-Draft Conference List Event For SIP January 2007
5. XML Schema
The following is the XML schema for the application/conference-
list+xml data format.
The notification body MUST follow below XML Schema format and
structure:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns="urn:ietf:params:xml:ns:conference_list"
targetNamespace="urn:ietf:params:xml:ns:conference_list"
elementFormDefault="qualified">
<xs:element name="conference-list">
<xs:complexType>
<xs:sequence>
<xs:element name="conferences">
<xs:complexType>
<xs:sequence>
<xs:element name="conference"
maxOccurs="unbounded">
<xs:complexType>
<xs:attribute name="id" use="required">
<xs:simpleType>
<xs:restriction base="xs:string"/>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="display-name"
use="required">
<xs:simpleType>
<xs:restriction base="xs:string"/>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="status"
use="required">
O. Koren Expires July 7, 2007 [Page 7]
Internet-Draft Conference List Event For SIP January 2007
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="active"/>
<xs:enumeration value="close"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="resource" use="required">
<xs:simpleType>
<xs:restriction base="xs:string"/>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="version" use="required">
<xs:simpleType>
<xs:restriction base="xs:integer"/>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="state" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="partial"/>
<xs:enumeration value="full"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
O. Koren Expires July 7, 2007 [Page 8]
Internet-Draft Conference List Event For SIP January 2007
</xs:complexType>
</xs:element>
</xs:schema>
6. Example
In the following example, Bob subscribes to the conference server in
order to get the entire conference-list.
Bob SUBSCRIBE to conference-list
SUBSCRIBE sip:Bob@example.com SIP/2.0
Via: SIP/2.0/UDP x12.example.com;branch=z9hG4bKy5as148
From: sip:Bob@example.com;tag=146sa4
To: sip:Bob@example.com
Call-ID: 553542@x12.example.com
Max-Forwards: 70
CSeq: 1 SUBSCRIBE
Contact: sip:Bob@x12.example.com
Event: conference-list
The conference server responds "200 OK" to the conference-list
SUBSCRIBE request.
SIP/2.0 200 OK
Via: SIP/2.0/UDP x12.example.com;branch=z9hG4bKy5as148
From: sip:Bob@example.com;tag=146sa4
To: sip:Bob@example.com;tag=1251fd
Call-ID: 553542@x12.example.com
CSeq: 1 SUBSCRIBE
Contact: sip:conference1.example.com
Expires: 3600
Event: conference-list
O. Koren Expires July 7, 2007 [Page 9]
Internet-Draft Conference List Event For SIP January 2007
Then the conference server sends a first full NOTIFY to the
conference-list SUBSCRIBE.
NOTIFY sip:Bob@x12.example.com SIP/2.0
Via: SIP/2.0/UDP conference1.example.com;branch=z9hG4bKy5as148
From: sip:Bob@example.com;tag=1251fd
To: sip:Bob@example.com;tag=146sa4
Call-ID: 553542@x12.example.com
CSeq: 5 NOTIFY
Contact: sip:conference1.example.com
Event: conference-list
Subscription-State: active
Max-Forwards: 70
Content-Type: application/conference-list+xml
Content-Length:
<?xml version="1.0"?>
<conference-list xmlns="urn:ietf:params:xml:ns:conference-list"
version="1" state="full">
<conferences resource="sip:Bob@example.com">
<conference id="sip:conference_111@example.com" display-
name="sip:conference_111@example.com" status="active"/>
<conference id="sip:conference_112@example.com" display-
name="sip:conference_112@example.com" status="active"/>
<conference id="sip:conference_113@example.com" display-
name="sip:conference_113@example.com" status="active"/>
<conference id="sip:conference_114@example.com" display-
name="sip:conference_114@example.com" status="active"/>
</conferences>
</conference-list>
Bob responds with "200 OK" to the NOTIFY:
O. Koren Expires July 7, 2007 [Page 10]
Internet-Draft Conference List Event For SIP January 2007
SIP/2.0 200 OK
Via: SIP/2.0/UDP conference1.example.com;branch=z9hG4bKy5as148
From: sip:Bob@example.com;tag=1251fd
To: sip:Bob@example.com;tag=146sa4
Call-ID: 553542@x12.example.com
CSeq: 5 NOTIFY
Partial NOTIFY to conference-list SUBSCRIBE due to changes in
existing conferences (conference_111 & conference_114 closed) and
joining a new conference (conference_115)
NOTIFY sip:Bob@x12.example.com SIP/2.0
Via: SIP/2.0/UDP conference1.example.com;branch=z9hG4bKy5as148
From: sip:Bob@example.com;tag=1251fd
To: sip:Bob@example.com;tag=146sa4
Call-ID: 553542@x12.example.com
CSeq: 14 NOTIFY
Contact: sip:conference1.example.com
Event: conference-list
Subscription-State: active
Max-Forwards: 70
Content-Type: application/conference-list+xml
Content-Length:
<?xml version="1.0"?>
<conference-list xmlns="urn:ietf:params:xml:ns:conference-list"
version="2" state="partial">
<conferences resource="sip:Bob@example.com">
<conference id="sip:conference_111@example.com" display-
name="sip:conference_111@example.com" status="close"/>
O. Koren Expires July 7, 2007 [Page 11]
Internet-Draft Conference List Event For SIP January 2007
<conference id="sip:conference_114@example.com" display-
name="sip:conference_114@example.com" status="close"/>
<conference id="sip:conference_115@example.com" display-
name="sip:conference_115@example.com" status="active"/>
</conferences>
</conference-list>
Bob responds with "200 OK" to the partial NOTIFY:
SIP/2.0 200 OK
Via: SIP/2.0/UDP conference1.example.com;branch=z9hG4bKy5as148
From: sip:Bob@example.com;tag=1251fd
To: sip:Bob@example.com;tag=146sa4
Call-ID: 553542@x12.example.com
CSeq: 14 NOTIFY
Bob subscribes from another UA to conference-list and gets a new full
notification from the conference server (with the most updated
conference status):
NOTIFY sip:Bob@x12.example.com SIP/2.0
Via: SIP/2.0/UDP conference1.example.com;branch=z9hG4bKy5as148
From: sip:Bob@example.com;tag=1251fd
To: sip:Bob@example.com;tag=146sa4
Call-ID: 553635@x12.example.com
CSeq: 35 NOTIFY
Contact: sip:conference1.example.com
Event: conference-list
Subscription-State: active
Max-Forwards: 70
Content-Type: application/conference-list+xml
Content-Length:
O. Koren Expires July 7, 2007 [Page 12]
Internet-Draft Conference List Event For SIP January 2007
<?xml version="1.0"?>
<conference-list xmlns="urn:ietf:params:xml:ns:conference-list"
version="1" state="full">
<conferences resource="sip:Bob@example.com">
<conference id="sip:conference_112@example.com" display-
name="sip:conference_112@example.com" status="active"/>
<conference id="sip:conference_113@example.com" display-
name="sip:conference_113@example.com" status="active"/>
<conference id="sip:conference_115@example.com" display-
name="sip:conference_115@example.com" status="active"/>
</conferences>
</conference-list>
Bob responds with "200 OK" to the NOTIFY:
SIP/2.0 200 OK
Via: SIP/2.0/UDP conference1.example.com;branch=z9hG4bKy5as148
From: sip:Bob@example.com;tag=1251fd
To: sip:Bob@example.com;tag=146sa4
Call-ID: 553635@x12.example.com
CSeq: 35 NOTIFY
7. IANA Considerations
TBD
8. Security Considerations
TBD
9. Acknowledgements
Thanks to Aloni Tali-Natali and Michael Fortinsky for their help and
support.
O. Koren Expires July 7, 2007 [Page 13]
Internet-Draft Conference List Event For SIP January 2007
10. Change History
TBD
11. References
11.1 Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[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.
[RFC3265] Roach, A., "Session Initiation Protocol (SIP)-Specific
Event Notification", RFC 3265, June 2002.
[RFC4575] Rosenberg, J., Schulzrinne, H., Levin, O. Ed., "A Session
Initiation Protocol (SIP) Event Package for Conference State",
August 2006.
11.2 Informative References
[RFC3857] Rosenberg, J., "A Watcher Information Event Template-
Package for the Session Initiation Protocol (SIP)", August 2004.
Author's Addresses
Oded Koren
Comverse
29 Habarzel St,
Tel Aviv 69710, Israel
Phone: +972 3 765 5395
Email: oded.koren@comverse.com
O. Koren Expires July 7, 2007 [Page 14]
Internet-Draft Conference List Event For SIP January 2007
URI: http://www.comverse.com
Intellectual Property Statement
The IETF takes no position regarding the validity or scope of any
Intellectual Property Rights or other rights that might be claimed to
pertain to the implementation or use of the technology described in
this document or the extent to which any license under such rights
might or might not be available; nor does it represent that it has
made any independent effort to identify any such rights. Information
on the procedures with respect to rights in RFC documents can be
found in BCP 78 and BCP 79.
Copies of IPR disclosures made to the IETF Secretariat and any
assurances of licenses to be made available, or the result of an
attempt made to obtain a general license or permission for the use of
such proprietary rights by implementers or users of this
specification can be obtained from the IETF on-line IPR repository at
http://www.ietf.org/ipr.
The IETF invites any interested party to bring to its attention any
copyrights, patents or patent applications, or other proprietary
rights that may cover technology that may be required to implement
this standard. Please address the information to the IETF at
ietf-ipr@ietf.org.
Disclaimer of Validity
This document and the information contained herein are provided on an
"AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Copyright Statement
Copyright (C) The Internet Society (2007).
This document is subject to the rights, licenses and restrictions
contained in BCP 78, and except as set forth therein, the authors
retain all their rights.
O. Koren Expires July 7, 2007 [Page 15]
Internet-Draft Conference List Event For SIP January 2007
Acknowledgment
Funding for the RFC Editor function is currently provided by the
Internet Society.
O. Koren Expires July 7, 2007 [Page 16]