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Kommunikatsiooniteenuste arendus IRT0080

Learn about SIP architecture, SIP messages, SIP extensions, application in multimedia, user agents, call scenarios, and more. Explore how SIP facilitates rich media communications and conference functions. Gain insights into the role of proxy and redirect servers in media transport and signaling.

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Kommunikatsiooniteenuste arendus IRT0080

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  1. Kommunikatsiooniteenuste arendusIRT0080 Loeng 6/2009Avo Otstelekommunikatsiooni õppetool, TTÜ raadio- ja sidetehnika inst.avots@lr.ttu.ee

  2. Meediateenuse tagamine (IMS) Teenuse kasutus Teenuse haldus Juurdepääs

  3. Session Initiation Protocol (SIP) • Originally specified in RFC 2543 (March 1999) • RFC 3261, new standards track released in June 2002 • An application-layer control signaling protocol for creating, modifying and terminating sessions with one or more participants • A component that can be used with other IETF protocols to build a complete multimedia architecture (e.g. RTP, RTSP, MEGACO, SDP)

  4. SIP Architecture • Client-server in nature • Main entities: • User Agent • Proxy Server • Redirect Server • Registration Server • Location Server

  5. S I P sõnumid (RFC3261) • INVITE – meediasessiooni algatamise kutse saatmine kasutajale. • ACK – kinnitus INVITE sõnumiga sessiooni algatamise kutse saamise kohta. • BYE – meediasessiooni lõpetamine. • CANCEL – pooleliolevate päringute katkestamine (ei katkesta pooleliolevat meedia-sessiooni). • OPTIONS – serveri võimaluste küsimine. • REGISTER – kasutaja registreerumine SIP serveris

  6. Lisandused /kohe!!/ PRACK – esialgne kinnitus (RFC 3262) SUBSCRIBE – sündmusest teavitamiseks registreerumine (RFC 3265) NOTIFY – kasutajate teavitamine sündmusest (RFC 3265) PUBLISH – serveri teavitamine sündmusest ... ...

  7. Application SIP Session Establishment and Call Termination

  8. Call Redirection Using a Redirect Server

  9. Call Proxy Scenario

  10. 2,3 5,6 Redirect Server Location Service 1 4 7 SIP Proxy SIP Proxy SIP Proxy 11 10 12 SIP User Agent SIP User Agent 9 (Caller) (Caller) 8 Non-SIP Protocol Proxy/Redirect Servers and UA

  11. Media Transport Signaling QoS Text Messaging Audio Video UAC UAS RTCP RTP UDP Design and Implementation User Agents (Clients)

  12. Ülesehitus Clients Agency Public Internet Encrypted Video and Audio

  13. Softswitch and Gateways Proxy Server Conferencing IP Phones IVR Voice Gateways NAT Apps RFC 3261 3PCC 3GPP Conf NAT/FW sip-01 IM RFC 2543 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 Realisatsioonide areng

  14. “Rich Media Communications” Only options that make sense appear • Send an instant message • Start a voice conversation • Start a video conversation • Send email • Start a rich media session • Show profile/directory entry • Make a phone call • Right now • As soon as possible • First available slot See availability and select people in any context Select method of communication Decide when to communicate System does the rest

  15. Conference Functions Conference Policy Conference Conference Policy Focus Notification Server Service Non - SIP SIP Dialog SIP Subscription Conference Participant Konverentsi ülesehitus

  16. Multicast Network Media Multisaade

  17. Signaling Media Hajutatud korraldus

  18. Conference Server Signaling Media Tsentraalne korraldus

  19. Centralized conference • A centralized conference is an association of endpoints, called conference participants, with a central endpoint, called a conference focus. The focus has direct peer relationships with the participants by maintaining a separate call signaling interface with each. Consequently, in this centralized conferencing model, the call signaling graph is always a star.

  20. Multicast Network Signaling Media Jaotatud funktsioonid

  21. Signaling Media - Server-terminalis mudel

  22. Conference System Conference Object Conference Object Conference Floor Notification Control Control Foci Service Server Server Conference Floor Call Notification Control Control Control Protocol Protocol Protocol Protocol Conference Floor Call Notification Control Control Control Client Client Client Client Conference Client XCON arhitektuur

  23. Indicating User Agent Capabilities in SIP (S): • [RFC3840] defines a mechanism for carrying capability information about a user agent in REGISTER requests and in dialog-forming requests like INVITE. It has found use with conferencing (the is focus parameter declares that a user agent is a conference server) and with applications like push-to-talk.

  24. Basic Network Media Services with SIP (I) • [RFC4240] defines a way for SIP application servers to invoke announcement and conferencing services from a media server. This is accomplished through a set of defined URI parameters which tell the media server what to do, such as what file to play and what language to render it in.

  25. Lõpulingid (6) http://en.wikipedia.org/wiki/Next_Generation_Networking http://dev2dev.bea.com/pub/a/2006/06/ims-sip-voicexml.html http://en.wikipedia.org/wiki/IP_Multimedia_Subsystem http://en.wikipedia.org/wiki/Session_Initiation_Protocol http://en.wikipedia.org/wiki/Media_Gateway_Control_Protocol

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