SPEERMINT WG A. Houri
Internet-Draft IBM
Intended status: Standards Track E. Aoki
Expires: August 29, 2007 AOL LLC
S. Parameswar
Microsoft Corporation
February 25, 2007
Presence & IM Use Cases
draft-ietf-speermint-consolidated-presence-im-usecases-00.txt
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Abstract
The document describes several use cases of peering between two or
more service providers that provide real time collaboration services
and presence and IM in particular. These service providers create a
peering relationship between themselves thus enabling their users to
collaborate with users on other communities. The target of the
document is to help understanding the requirements for peering
between domains with regard to real time services
Table of Contents
1. Requirements notation . . . . . . . . . . . . . . . . . . . . 3
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1. Simple Interdomain Subscription . . . . . . . . . . . . . 5
3.2. List Interdomain Subscription . . . . . . . . . . . . . . 5
3.3. Authorization Migration . . . . . . . . . . . . . . . . . 5
3.4. Page mode IM . . . . . . . . . . . . . . . . . . . . . . . 6
3.5. Session based IM . . . . . . . . . . . . . . . . . . . . . 6
3.6. Other services . . . . . . . . . . . . . . . . . . . . . . 6
3.7. Federation . . . . . . . . . . . . . . . . . . . . . . . . 6
4. Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5. Security Considerations . . . . . . . . . . . . . . . . . . . 10
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.1. Normative References . . . . . . . . . . . . . . . . . . . 11
6.2. Informative References . . . . . . . . . . . . . . . . . . 11
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 12
Intellectual Property and Copyright Statements . . . . . . . . . . 13
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1. Requirements notation
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 [1].
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2. Introduction
Real Time Collaboration (RTC) services are becoming as prevalent and
essential for users on the Internet as email. While RTC services
can, like email, be implemented directly by users in a point-to-point
fashion, they are often provided for or on behalf of a community of
users within an administrative domain. As the use of these services
grows, users increasingly have the need to communicate with users not
only within their own community but with those in other communities
as well. In practice, each community is controlled by some
authority, and so there is a need to provide for easier establishment
of connectivity between communities, and the management of the inter-
community link. This document contains a set of use cases that
describe how peering between communities may be used. The use cases
are intended to help in creating a set of requirements that will
enable more secure and easier peering between communities that
provide RTC services.
This document will use the terminology as defined in [2] unless
otherwise is stated.
The following sections provide several use cases followed by a
discussion on what these use cases may imply regarding the
functionalities that need to be provided for in order to implement
those use cases
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3. Use Cases
3.1. Simple Interdomain Subscription
Assume that we have two peer networks [2], peer network A and peer
network B. User Alice@A.com wants to subscribe to user Bob@B.com and
get his presence information. In order to do so, Alice@A.com may
connect directly to B.com and subscribe to Bob's presence
information. However, peer network B is not willing to support
subscriptions from any user in the network and is willing only to
support its users and users that are coming from other peer networks
that peer network B trusts.
In reality what will happen is that peer network A will connect to
peer network B and will send Alice's subscription on Bob to peer
network B. When peer network B has new information on Bob it will
send notifications to peer network A that will pass them to Alice.
3.2. List Interdomain Subscription
This is the same as the simple interdomain subscription use case but
in this case Alice subscribes to a URI that represents a list of
users in peer network B [3]
3.3. Authorization Migration
if many users from one peering network watch presentities in another
peering network, it may be possible that many watchers from one
peering network will subscribe to the same user in the peering
network. However, due to privacy constraints, each peering network
will have to send multiple copies of the watched presence document.
The privacy constraints enable a user to provide different persence
document to e.g. friends, co-workers etc. The need to send multiple
copies between the peering networks is very inefficient and causes
redundant traffic between the peering networks.
In order to make the subscription between peering networks more
efficient there needs to be a way to enable peering networks to agree
to share privacy information between them. This will enabble sending
a single copy (the full copy) of the presence document of of the
watched user and letting the receiving peering network to be
responsible to send the right values to the right watchers according
to the privacy definitions of the watched user that were delegated to
it from the peering network where the watched user resides.
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3.4. Page mode IM
In this use case a user from one peer network sends a page mode [4]
IM to a user on another peer network. As with subscription, the
message will pass between the users through the SBEs [2] of the peer
networks.
3.5. Session based IM
In this use case a user from one peer network creates an MSRP [5]
session with a user from another peer network. The session
establishment and the messages will pass between the users through
the SBEs [2] of the peer networks.
3.6. Other services
In addition to media (voice/video) which are out of scope for this
document only presence and IM are more or less fully standardized in
real time collaboration. However there are many other services that
are being standardized or may be implemented using minimal extensions
to existing standards. These include:
o N-way chat - Enable a multi participant chat that will include
users from many peer networks.
o File transfer - Send files from a user in one peer network to a
user in another peer network.
o Document sharing - Sharing and editing a document between users in
different peer networks
There are many more collaboration services that can be thought about.
Enabling peering between networks for some of the services will
create a basis for defining many more services
3.7. Federation
Federation as defined in [2] is a use case also in real time
collaboration.
Real time collaboration services may benefit even more the voice/
video services from federation. Collaboration by its definition is
something that is stronger where there many more parties
collaborating and federation is certainly a good way to achieve
greater collaboration.
Additional "side" services as security, lawful interception, logging
and more may be provided to the peer networks that are members of the
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federation.
Note that federation is also known as clearing house in the real time
collaboration industry.
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4. Discussion
The use cases described above may seem to be simple. However, in
reality it is not so. The following describes issues that need to be
solved in order to enable the creation of the use cases without the
need to negotiate each peer network relationship separately and
manually.
o Connectivity - A peer network needs a mechanism to learn the
connectivity setting of the other peer network. Examples of
connectivity parameters may be list of domains that the peer
network is representing, firewall and NAT settings and more.
o Security - The peer network or the federation that is being
connected to may require certain level of security in order to
accept connections from another peer network. For example, peer
network B may require that only TL'S will be used and it can also
specifies the type and level of certificates that should be used.
Community A will need a way to discover and use these parameters.
o Privacy - In many peer networks that provide real time
collaboration services there are inter mechanisms that enable a
user to configure the level of privacy that they wish to achieve.
for example, a user may say that only certain users will be able
to see him/her etc. Similar mechanisms are required to be in
place in peering and in the federation model.
o Services - When two or more peer networks are peering for real
time collaboration services, each peer network has to have an
understanding regarding the services that are provided by the
other peer network. This may/should include: A) The list of
services that are provided by the peer network or the federation.
B) Parameters for each services that may be different between peer
networks. For example if the peer network provides for page mode
IMs or session based IMs or both? Is presence filtering or
partial notification is supported? Are subscription to resource
lists [3] are supported?
o Mappings - Many times one peer network may have different set of
values for different statuses of a user. For example "Do not
Disturb" is translated to "Busy" in the other peer network. Each
peer network that peers with another peer network or with a
federation, should have means for translating the values that may
differ appropriately.
o Good Citizenship - presence and IM have many network and
processing demands both form the point of view of number of
messages and the point of view of processing time. In order to
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enable peer networks connecting to each other without overloading
each other, each peer network should be able to learn what is the
expected behavior by the connected to peer network or federation
and act accordingly.
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5. Security Considerations
This document discusses use cases for peering between communities.
It is very clear that the protocols that will enable and make such
peering easier will have significant security considerations, there
are out of scope for a use case document.
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6. References
6.1. Normative References
[1] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
6.2. Informative References
[2] Meyer, D., "SPEERMINT Terminology",
draft-ietf-speermint-terminology-06 (work in progress),
September 2006.
[3] Roach, A., Campbell, B., and J. Rosenberg, "A Session Initiation
Protocol (SIP) Event Notification Extension for Resource Lists",
RFC 4662, August 2006.
[4] Campbell, B., Rosenberg, J., Schulzrinne, H., Huitema, C., and
D. Gurle, "Session Initiation Protocol (SIP) Extension for
Instant Messaging", RFC 3428, December 2002.
[5] Campbell, B., "The Message Session Relay Protocol",
draft-ietf-simple-message-sessions-18 (work in progress),
December 2006.
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Authors' Addresses
Avshalom Houri
IBM
Science Park Building 18/D
Rehovot,
Israel
Email: avshalom@il.ibm.com
Edwin Aoki
AOL LLC
360 W. Caribbean Drive
Sunnyvale, CA 94089
USA
Email: aoki@aol.net
Sriram Parameswar
Microsoft Corporation
One Microsoft Way
Redmond, WA 98052
USA
Email: Sriram.Parameswar@microsoft.com
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