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MSRP The Message Session Relay Protocol

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Messaging Schemes 1/2. Page-mode messaging. That track only individual messages can be ... message-header CRLF [message-body] 10. 11. SIP for Instant Messaging ... – PowerPoint PPT presentation

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Title: MSRP The Message Session Relay Protocol


1
MSRP - The Message Session Relay Protocol
  • speakerwenping zhang
  • date2007.11.29

2
Outline
  • Messaging Schemes
  • Page-mode
  • SIP SDP
  • Session-mode
  • MSRP
  • SIP
  • Server
  • Message syntax
  • Method
  • SDP
  • Structure
  • Drawback
  • MSRP
  • Method
  • Future Work
  • Reference

3
Instant Messaging
4
Messaging Schemes 1/2
  • Page-mode messaging
  • That track only individual messages can be
    described.
  • Uses the SIP Method MESSAGE for transmitting
    data.

5
Messaging Schemes 2/2
  • Session-mode messaging
  • Messaging that is part of a "session" with a
    definite start and end.
  • The new proposed model by SIMPLE work group using
    MSRP Protocol.

SEND msrp//jon.xxxx.xxxx.xxxx1111/2s93i93idjtcp
6
Session Initiation Protocol (SIP)
  • A signaling protocol
  • The setup, modification, and tear-down of
    multimedia sessions
  • SIP SDP
  • Describe the session characteristics
  • Separate signaling and media streams

7
SIP Server
  • Proxy servers
  • Handle requests or forward requests to other
    servers
  • Can be used for call forwarding, time-of-day
    routing, or follow-me services

8
(No Transcript)
9
SIP Messaging Syntax
  • Text-based
  • Similar to HTTP
  • Disadvantage more bandwidth consumption
  • SIP messages
  • Message start-line
  • message-header CRLF
  • message-body

10
(No Transcript)
11
SIP for Instant Messaging
  • The IETF working group SIP for Instant
    Messaging and Presence Leveraging Extensions
    (SIMPLE)
  • A new SIP method MESSAGE (RFC 3428)
  • This request carries the actual message in a
    message body.
  • A MESSAGE request does not establish a SIP dialog.

12
(No Transcript)
13
(No Transcript)
14
The Session Description Protocol (SDP)
  • The Most Common Message Body
  • Be session information describing the media to be
    exchanged between the parties
  • SDP, RFC 2327 (initial publication)
  • SIP uses SDP in an answer/offer mode
  • An agreement between the two parties as to the
    types of media they are willing to share
  • RFC 3264 (An Offer/Answer Model with SDP)
  • To describe how SDP and SIP should be used
    together

15
The Structure of SDP
  • SDP simply provides a format for describing
    session information to potential session
    participants.
  • Text-based Protocol
  • The Structure of SDP
  • Session Level Info
  • Name of the session
  • Originator of the session
  • Time that the session is to be active
  • Media Level Info
  • Media type
  • Port number
  • Transport protocol
  • Media format

16
(No Transcript)
17
Drawback 1/2
  • Routing

Proxy server
18
Drawback 2/2
  • Overhead

19
The Message Session Relay Protocol (MSRP)
  • MSRP is a text-based, connection-oriented
    protocol for exchanging arbitrary (binary) MIME
    content, especially instant messages.
  • The exchange is carried by some signaling
    protocol, such as the Session Initiation Protocol
    (SIP). This allows a communication user agent to
    offer a messaging session as one of the possible
    media-types in a session.
  • SIP can use an offer/answer model to transport
    the MSRP URIs for the media in SDP.

20
Alice
Bob
INVITE
INVITE sipbob_at_biloxi.example.com SIP/2.0 To
ltsipbob_at_biloxi.example.comgt From
ltsipalice_at_atlanta.example.comgttag786 Call-ID
3413an89KU Content-Type application/sdp cIN
IP4 atlanta.example.com mmessage 7654 TCP/MSRP
aaccept-typestext/plain apathmsrp//atlanta.
example.com7654/jshA7weztastcp
200 OK
SIP/2.0 200 OK To ltsipbob_at_biloxi.example.comgtta
g087js From ltsipalice_at_atlanta.example.comgttag
786 Call-ID 3413an89KU Content-Type
application/sdp cIN IP4 biloxi.example.com mmes
sage 12763 TCP/MSRP aaccept-typestext/plain a
pathmsrp//biloxi.example.com12763/kjhd37s2s20w2
atcp
ACK
MSRP Session
21
MSRP communication primitives 1/2
  • SEND Method
  • Be used to deliver a complete message or a chunk
    (a portion of a complete message).

src www.cs.columbia.edu/hgs/teaching/ais/slides/
sip-suthan.ppt
22
MSRP communication primitives 2/2
  • REPORT Method
  • It report on the status of a previously sent
    message, or a range of bytes inside a message.

23
Future Work
  • Joins the MSRP mechanism in existing SIP phone
    (Linux Linphone).
  • How solves MSRP passes through NAT the question?

24
Reference
  • RFC 3261 - SIP Session Initiation Protocol
  • http//www.ietf.org/rfc/rfc3261.txt
  • RFC 3428 - Session Initiation Protocol (SIP)
    Extension for Instant Messaging
  • http//www.ietf.org/rfc/rfc3428.txt
  • RFC 2327 - SDP Session Description Protocol
  • http//www.ietf.org/rfc/rfc2327.txt
  • RFC 3264 - An Offer/Answer Model with the Session
    Description Protocol (SDP)
  • http//www.ietf.org/rfc/rfc3264.txt
  • The Message Session Relay Protocol
  • draft-ietf-simple-message-sessions

25
END
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