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Sandbakken, Ed. This document defines the necessary tools for establishing multi-party chat sessions, or chat rooms, using MSRP. 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 fhat inappropriate to use Internet-Drafts as reference material or to cite them chat than as "work in progress.
This document defines the necessary tools for establishing multi-party chat sessions, or chat rooms, using MSRP. Note that other groups may also distribute chat documents as Internet-Drafts. Internet-Drafts are chay documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time.
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It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress. All rights reserved. Please review these documents carefully, as they describe your rights and restrictions with respect Niemi, et al. Without obtaining an adequate from the person s controlling the copyright in such materials, this document may not be modified outside the IETF Standards Process, and derivative works of it may not be created chat the IETF Standards Process, except to format it for publication as an RFC or to translate it into languages other than English.
Niemi, et al. Motivations and Requirements. Overview of Operation. Creating, ing, and Deleting chaat Chat Room. Creating a Chat Room.
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ing a Chat Room. Deleting a Chat Room. Sending and Receiving Instant Messages. Regular Messages. Private Messages. MSRP reports and responses. Using Nicknames within a Conference. Modifying a Nickname.
Removing a Nickname. Nicknames in Conference Event Packages. The SDP 'chatroom' attribute. ing a chat room. Setting up a nickname.
Sending a regular message to the chat room. Sending a private message to a participant. Chunked private message. Nickname in a conference information document. IANA Considerations. New SDP Attribute. Security Considerations.
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Normative References. Informative References. In another application of SIP, a user agent can in a multi-party conversation called a chat that is hosted by a specialized user agent called a focus [ RFC ]. Such a conference can naturally involve MSRP sessions. It is the responsibility of an entity handling the media to relay instant messages received from one participant to the rest of the participants in the conference.
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Several such systems already exist in the Internet. Participants in a chat room can be identified with a pseudonym or nickname, and decide whether their real identity is chat to other participants. Participants can also use a rich set of features such as the ability to send private instant messages to other participants.
Similar conferences supporting chat rooms are already available today. Specifying equivalent functionality for MSRP-based systems provides competitive features and enables interworking between the systems. This document defines requirements, conventions, and extensions for providing private chat and nickname management in centralized conferences with MSRP. Participants in a chat room can be identified by a pseudonym, and decide if their real identity is disclosed to other participants.
Should requirements arise, future mechanisms cat providing similar functionality in generic conferences might 21 developed, for example, where the media is not only restricted to MSRP. The mechanisms described in this document provide a future compatible short-term solution for MSRP centralized conferences. In addition to that terminology, we introduce some new terms: Nickname: a pseudonym or descriptive name associated to a participant.
See Section 7 for details Multi-party chat: an instance of a tightly coupled conference, in which the chat exchanged between the participants consist of MSRP based instant messages. Also known as a chat room. Chat Room: a synonym for a multi-party dhat. Sender: the conference participant that originally created an instant message and sent it to the chat room for delivery. Recipient: the destination conference participant s. This defaults to the full conference participant list, minus the IM Sender.
The MSRP switch has a similar role to a conference mixer with the exception that the MSRP switch does not actually "mix" together different input media streams; it merely relays the messages between participants. Private Instant Message: an instant message sent in a chat room intended for a single participant.
A private IM is usually rendered distinctly from the rest of the IMs, indicating that the message was a private communication. The allocation of such a URI is out of scope of this specification. An anonymous URI must be valid for the length of the chat, and will be utilized by the MSRP switch to forward messages to and from anonymous participants.
Expires June 18, [ 5] Internet-Draft Multi-party Chat MSRP December Conference Event Package: a notification mechanism that allows conference participants to learn conference information including chat and state changes in a conference. Motivations and Requirements Although conference frameworks describing many types of conferencing applications already exist, such as the Framework for Centralized Conferencing [ RFC ] and the SIP Conferencing Framework [ RFC ], the exact details of session-based instant messaging conferences are not well-defined at the moment.
To allow interoperable chat implementations, for char conference- aware, and conference-unaware user agents, certain conventions for MSRP conferences need to be defined. It also seems beneficial to provide a set of features that enhance the baseline multi-party MSRP in order to be able to create systems that have functionality on par with existing chat systems, as well as enable building interworking gateways to these existing chat systems.
We define the following requirements: REQ A basic requirement is the existence of a multi-party chat, where participants can and leave the conference and get instant messages exchanged to the rest of the participants. REQ A conference participant must be able to char the identities of the sender and recipient of the 21 IMs. REQ A conference participant must be able to determine the recipient of the received message. For instance, the recipient of the message might be the entire conference or a single participant of cnat conference i.
REQ It must be possible to send a message to a single participant within the conference i. REQ A conference participant may have a nickname or pseudonym associated with their real identity. REQ It must be possible that a participant is only known by an anonymous identity and not their real identity to fhat rest of the conference. REQ It must be possible for the conference participants to learn the chat room capabilities described in this document.
Overview of Operation In order to set up a conference, one must first be created. Users wishing to host a conference themselves can of course do just that; their User Agent UA simply morphs from an ordinary UA into a special purpose one called a Focus UA. Another, commonly used setup xhat one where a dedicated node in the network functions as a Focus UA.
The conference focus processes the invitations, and as such, maintains SIP dialogs with each participant. In a multi-party chat, or chat room, MSRP is one of the established media streams. This is illustrated in Figure 1 Niemi, et al. However, unlike a conference mixer, the MSRP switch merely forwards messages between participants but doesn't actually mix the streams chqt any way. The system is illustrated in Figure 2. For example, participants can learn about other participants' chqt, including their nicknames.
A participant can also send a private instant message addressed to a participant whose identity has been learned, e.
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This specification supports the chat of private messages to one and only one recipient. However, Niemi, et al. It is assumed that an MSRP session is mapped to a chat room. Creating, ing, and Deleting a Chat Room 5. As long as the conference policy allows, the INVITE chay is accepted by the focus and the user is brought into the conference.
This information is known to the focus of the conference.
Therefore an interface between the focus and chag MSRP switch is assumed. However, the interface between the focus and the MSRP switch is outside the scope of this chat. Conference aware participants will detect that the peer is a focus due to the presence of the "isfocus" feature tag [ RFC ] in the Contact header field of the class response to the INVITE request. Conference unaware participants will not notice it cbat a focus, and can not apply the additional mechanisms defined in this document.
To and Chag headers. If a participant wants to remain anonymous to the rest of the participants in the conference, the participant's UA must provide an anonymous URI to the conference focus. The mechanism for acquiring an anonymous URI is outside the scope of this specification. The conference focus of a chat room MUST learn the chat room capabilities of each participant cht s the chat room.
The recipient would not be able to render the message as private, and any potential reply would be sent to the whole chat room. The policy can determine that the chat room is deleted when the creator leaves the conference, or with any out of band mechanism.
Sending and Receiving Instant Messages 6. Regular Messages This section describes the conventions used to send and receive instant messages that are addressed to all the participants in the chat room.