1. Session Initiation Protocol (SIP)
Speaker: Ni-Ya Li
Date: 2010/07/15

2. What Is SIP? A signaling protocol (通訊協定)
Create, modify, terminate a multimedia session
For Voice over Internet Protocol (VoIP) communication, use port 5060
Defined in RFC (Request For Comments) 3261
A client-server architecture
User Agent Server (UAS)
User Agent Client (UAC)
User Agent (UA) = UAS + UAC
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3. What Is SIP? (cont’d) SIP addressing (Uniform Resource Indicator)
(SIP-URI)
SIP request methods
REGISTER, {INVITE, BYE, CANCEL, ACK}, OPTIONS
SIP request syntax
INVITE SIP/2.0
SIP response status code
100 Trying, 200 OK, 302 Moved temporarily, 403 Forbidden
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4. What Is SIP (cont’d) Work with Session Description Protocol (SDP)
c = connection information, ex: c = IN IP
m = media description, ex: m = audio 7078 RTP/AVP 0
a = media attribute, ex: a = rtpmap:0 PCMU/8000/1
Real-time Transport Protocol (RTP)
SIP
SDP
RTP
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5. SIP Call Flow (UA to UA)
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6. Three Types of Server Proxy server Registrar Redirect server
Accept requests/responses and forward them onward
Registrar
Provide a server with an address at which the user can be reached for SIP sessions
Redirect server
Response with a alternative contact address
Can be installed on the same device
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7. Proxy Server
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8. Redirect Server
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9. Registrar
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10. SIP Call through Proxy Server
Conversation
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11. Call Forking
INVITE
INVITE
INVITE OK
CANCEL OK
Conversation
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12. SIP Method - OPTIONS
Determine the ability of UA
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13. SIP - Instant Message (IM)
Defined in RFC 3428
MESSAGE method
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14. Review A signaling protocol use port 5060 Client/Server architecture
Addressing way
Response status code
Six request methods
Three proxies
Call flow
Call forking
Instant message (IM)
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15. References
lab orientation session
Daniel Collins, “Carrier Grade Voice over IP,” McGraw-Hill, September 2002
“Session Initiation Protocol,” IETF RFC 3261, June 2002
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16. X-Lite / Linphone
Speaker: Ni-Ya Li

17. X-Lite
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18. Show Menu
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19. Account Setting (cont’d)
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20. Account Setting (cont’d)
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21. Account Setting (cont’d)
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22. Register Successfully
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23. Make A Call
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24. Terminate A Call
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25. Add A Contact User
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26. Add A Contact User (cont’d)
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27. Send Instant Message
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28. Send Instant Message (cont’d)
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29. Send Instant Message (cont’d)
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30. Linphone
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31. Account Setting
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32. Account Setting (cont’d)
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33. Account Setting (cont’d)
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34. Register Successfully
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35. Make A Call
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36. Terminate A Call
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37. Add A Contact User
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38. Send Instant Message
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39. References
X-Lite user guide
Linphone startup guide
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40. Exercise X-Lite/Linphone 擇一安裝 註冊上163.22.21.194，帳號/密碼是您的學號
開啟Wireshark，並且撥打一通電話給您隔壁的同學，由封包觀察SIP如何建立通話
同上，這次改送一則即時訊息給您隔壁的同學
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