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SIP (Session Initiation Protocol)

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SIP (Session Initiation Protocol) : SIP IETF(Internet Engineering Task Force) SIP IP 1 ... – PowerPoint PPT presentation

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Title: SIP (Session Initiation Protocol)


1
SIP (Session Initiation Protocol)
  • ??? ???

2
SIP ??
  • IETF(Internet Engineering Task Force) ??
  • SIP ??
  • IP ?? ??? 1? ??? ????? ??? ??, ??, ????? ??
  • e-mail? ??? SMTP(simple mail transfer protocol?
    ?? ??? HTTP(Hypertext Transfer Protocol)? ????
    ???
  • ???? ?????-?? ???? (textual client-server
    protocol)
  • ???? ?????-?? ?????? ??? ?????? ?? ????, ??? ???
    ?? ??

3
Component of the overall IETF multimedia data and
control architecture
Stream Control
Audio
Video
RealPlay
SIP
SDP
RTP/RTCP
HTTP
MEGACO
RSVP
RTSP
UDP
TCP
Internet Protocol
4
SIP ????
  • ? ?? ?? ??
  • UA (user agent)
  • ???? ??
  • UA (user agent)
  • UAC (User Agent Client) ??? ?? ?? ????? ??
  • UAS (User Agent Server) ??? ?? ??
  • ?? ?? ?? ??
  • Call ??

5
SIP ????
  • ???? ??
  • ??? ??(proxy server)
  • ??? ???? ??? ?? ??? ???? ??? ??, ?? ???? ??? ???
    ? ??? ??
  • SIP ??? ??? ??? ??? ?? ??? ?? ?????, ??? ????, ??
    UAS ??? ? ??? ??.
  • ??? ??(redirect server)
  • ??? ???? ?? ? ??? ???? ??? ?? ? ??? ?? ??? ??
    ??????? ???.
  • ??? ??? ?? ? ??? ??? ???? ??? ??? ???? ?????? ???
    ????.

6
SIP ???
  • INVITE, REGISTER, BYE, OPTIONS, ACK,CANCEL ???
  • INVITE
  • ???? ?? ????? ??
  • ?? ?? ??? ?? ??, ?? ??, ? ?? ??, ? ??? ??, ???
    ??? ?? ???? ??, ??? ??? ??? ??
  • REGISTER
  • ?? ??? SIP ??? ??
  • ???? incoming address? ?? ???? ??? outgoing
    address? ??? ??? ?? SIP ??(?? ?? ???? ??? ?????
    ???? ?? ???)?? ????.

7
SIP ???
  • BYE ???? ? ????? ??? ????.
  • OPTIONS ??? ?? ??? ?? ??? ????. ??? ?? ????? ???.
  • ACK ??? ??? ?? ??? ??? ?? ??
  • CANCEL ???? ??? ??

8
SIP ??
9
SIP ??
  • SIP UA? sipdong_at_company.com? ?? INVITE ??? ?? ?
    ??? ?? ???(local proxy)? ????.
  • ?? ???? DNS?? company.com? ?? ? ???? ?? SIP ???
    ???? ??? IP??? ????, ? ??? ??? ????.
  • company.com? ??? ??? dong? ???? ????? ? ???? ??
    d.user_at_university.edu? ??? ?? ??. ???? ? ??? ???
    ? ??? ?? ????.
  • ?? ???? DNS?? university.edu? ?? SIP ??? IP???
    ???? ??? ? ??? ????.

10
SIP ??
  • university ??? local database? ??
  • d.user_at_university.edu? ? ???? d.Yeo_at_inc.
    university.edu? ???? ??? ?? ????
  • university ??? ??? inc ??? ????
  • inc ??? ? ???? ?? ??? ???? ?? IP ??? ????? ???
    ????? ????.
  • ???? call? ?????, ? ??? 9,10, 11,12? ?? ??????
    ????.

11
?? ? ??
  • IETFs SIP related WG
  • SIP-WG
  • RFC3262 ?? ??? SIP ??? ?? ??
  • SIPPING-WG
  • ??? ????, ????? ??, 3GPP
  • SIMPLE-WG
  • SIP ??? ????? ???? ??? ??? ?? ??

12
SIP WG (contd)
  • ??
  • 2002? 7?? RFC3261 ??
  • SIP ??? ????? ?? 4?? ????
  • ???? ??? End to End ???? ??
  • SIP ? ?? ? ??? ???? ???? ?? ?? ??? ???? ??? ?????
    ?? ???? ?
  • ???? ??
  • ??? IP ????? ????? ??? ? ?? IP ??? ??? ??? ??? ?

13
SIP WG
  • ?? ??
  • ? ?? ? ?? ??? ?? ???
  • Caller Preference
  • Resource Priority
  • Connection Reuse
  • Non-INVITE ????
  • ?? ???
  • SIP Indensity ? ??? ?? ??
  • History Info
  • SIP Security ? S/MIME

14
SIPPING WG
  • ??
  • ??? ????? ????? ??? ??? ??? ??
  • 4?? ??
  • PSTN ? 3G telephony-equivalent ??
  • Speeching ? Hearing ? ??? ??? ??? SIP ?? ??
  • Call transfer, subscribe-notify, SIP ?? ?? ?? ???
    SIP ? ?? ??? ?? ??
  • ??? ??? SIP ? ??? ?? ??
  • ?? ??
  • NAT ? ?? ??
  • SIP Conferencing
  • ?????? ?? ??

15
Reference
  1. http//www.cs.columbia.edu/hgs/sip/
  2. The Session Initiation Protocol Providing
    Advanced Telephony Services Across the Internet
    ,Henning G. Schulzrinne and Jonathan D.Rosenberg,
    Bell Labs Technical Journal Oct.-Dec. 1998
  3. J. Rosenburg, H. Schulzrinne, G. Camarillo et
    al., SIP Session Initiation Protocol, RFC 3261,
    June 2002
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