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Title:

Session Initiation Protocol (SIP)

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... protocol that can establish, modify and terminate multimedia sessions or calls. ... SIP is used for initiation, control, and termination of multimedia ... – PowerPoint PPT presentation

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Title: Session Initiation Protocol (SIP)


1
Session Initiation Protocol (SIP)
By Zhixin Chen
2
Outline
  • What is SIP?
  • Fundamentals of SIP
  • Mobility Support Using SIP

3
What is SIP ?
  • An application-layer signaling protocol that can
    establish, modify and terminate multimedia
    sessions or calls.
  • Developed by IETF (Version 2, March 1999)
  • Applications Voice over IP, Multimedia
    Conferences, and Distance Learning etc.
  • Simple, scalable, extensible, and mobile.
    (Compared to H.323)

4
SIP Features
  • User Availability SIP determines the willingness
    of the called party to engage in communications.
  • User location SIP determines the terminal to be
    used for communication.
  • User Capabilities SIP negotiates the type of
    media and media parameters to be used for
    communication.
  • Call Setup and Handling SIP establishes,
    maintains and terminates the call.
  • Support Other Protocols RSVP (Resource
    Reservation Setup Protocol) , RTP (Real Time
    Transport Protocol) and RTCP(RTP Control
    Protocol), SDP (Session Description Protocol)

5
SIP Components
User Agent
PSTN
Gateway
6
SIP Components
  • User Agent includes User Agent Client (UAC) and
    User Agent Server (UAS). The user agent client
    sends the requests. The user agent server
    receives and processes the requests and returns
    responses.
  • Proxy Server is like an intermediary program that
    acts as both a server and a client. Requests are
    forwarded, possibly after rewriting the request
    message.
  • Redirect Server advertises the caller to contact
    another server directly. A redirect server can
    leave behind the call request after it has been
    processed.
  • Location Server contains the information about
    callee
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