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Chapter 5 SIP

Chapter 5 SIP. Session Initiation Protocol. How do we communicate?. Telephone (home, work, & cell phone) Email Text messaging Data sharing (PowerPoint, applications, white board, desktop, etc.) Audio/video File transfer Ink- tablet PC. Questions?.

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Chapter 5 SIP

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  1. Chapter 5 SIP Session Initiation Protocol

  2. How do we communicate? • Telephone (home, work, & cell phone) • Email • Text messaging • Data sharing (PowerPoint, applications, white board, desktop, etc.) • Audio/video • File transfer • Ink- tablet PC

  3. Questions? • …but how do we know where to find the person we want to communicate with • ...and given the availability of my resources, which of the persons devices do I want to communicate with • ..and what is the address of that device • ..and how does the person control his active/inactive devices • ..and how do we authenticate people • ..and how do we bridge this between organizations

  4. SIP Session Initiation Protocol • An emerging signaling protocol for: • Initiating, • Managing, and • Terminating messaging, voice, and video sessions • Internet Engineering Task Force (IETF) • Developed by the SIP Working Group • Published as IETF RFC 3261 • Connectivity using IP • May be extended for services such as: • call control services, • mobility, • interoperability with telephony systems, and more

  5. SIP and its Extensions • Presence • The willingness and ability of a user and their devices to communicate with other users on the network • SIP for Instant Messaging and Presence Leveraging Extensions (SIMPLE) • Authentication • Office integration

  6. SIP Functionality • SIP provides the following functionality: – User location (not geographical location) – User availability – User capabilities – Session set-up – Session management • SIP does not provide services – But it enables the system to provide services – It has been demonstrated that it is easy to provide services with SIP

  7. SIP Entities • User Agent – Initiates or Responds to SIP Transactions • User Agent Client (UAC) – Initiates SIP requests and accepts SIP responses • User Agent Server (UAS) – Accepts SIP requests and sends back SIP responses • Redirect Server – a UAS that generates 300 class SIP responses to requests it receives. Directs the UAC to contact an alternate set of URIs. • Proxy Server – An intermediate entity responsible for forwarding SIP requests to a target UAS or another proxy on behalf of the UAC. • Registrar – A UAS that accepts SIP REGISTER requests and updates the information from the request message into a location database.

  8. SIP Addressing • SIP uses Uniform Resource Identifiers (URIs). At least, SIP URIs and SIPS URIs are supported, although others (such as TEL URL) are commonly supported. – sip:Gonzalo.Camarillo@ericsson.com – sips:Gonzalo.Camarillo@ericsson.com – tel:+358-9-299-3371 – sip:proxy.atlanta.com:5060 – sip:another-proxy.biloxi.com;transport=UDP • SIP and SIPS URIs must include a host name, and may include username, may include port numbers, may include parameters • Address space is unlimited • Non SIP/TEL URIs are also valid under certain circumstances: HTTP, IM, PRES, MAILTO…

  9. SIP Session Establishment and Call Termination

  10. Call Redirection Using a Redirect Server

  11. Call Proxy Scenario

  12. Forking Proxy Example

  13. SIP Request Example

  14. SIP Response example

  15. Session Description Protocol • SDP is the protocol used to describe multimedia session announcement, multimedia session invitation and other forms of multimedia session initiation. • A multimedia session is defined, for these purposes, as a set of media streams that exist for a duration of time. • RFP 2327

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