1. 1 SIP Call Flow Speaker: Hz-Ping Huang; Huan-Yao Kang Date: 2007.10.24

2. Outline  Observation of Call Flow SIP Registration SIP Call 2

3. OBSERVATION OF CALL FLOW 3

4. SIP Registration  Registration  Registration Update  Contact List Request  Un-Registration  Unsuccessful Registration 4

5. SIP Call  Call Establishment  Through Two Proxy  No Answer  Busy  No Response  Temporarily 5

6. SIP REGISTRATION 6

7. Registration  正常執行 SER, 開啟 Ethereal, 接著開啟舊版 X-Lite( 假設 已經設定完成 ) 就可以擷取到註冊封包, 如下圖 : 7 UA SIP Server REGISTER 401 Unauthorized REGISTER 200 OK 0 Bindings 1 Bindings

8. Bindings  O Bindings 代表不帶 Contact header 的封包。  1 Bindings 代表帶 Contact header 的封包。 Un-Register  0 bindings  no contact Register  1 bindings  contact

9. Registration Update (1/3)  在正常 X-Lite and SER 已開啟情形下： 每隔１８０ sec 會重新要求ＲＥＧＩＳＴＥＲ一次

10. Registration Update (2/3) UA SIP Server REGISTER 401 Unauthorized REGISTER 200 OK 0 Bindings 1 Bindings 180 sec ．．．．．．

11. SIP Registration(3/3)  這個部分我們使用 X-Lite and SER, 直接 擷取封包  請更改 X-Lite 的 Advanced System Settings / SIP Settings, 設定 Reregister Proxy = 180

12. Contact List Request (1/2)  進入 System settings/ SIP Proxy/Default  設定 Display Name ： 2000 Username ： 2000 Authorization User:2000 Password ： 2000

13. Contact List Request (2/2) UA SIP Server REGISTER 401 Unauthorized REGISTER 200 OK 0 Bindings 1 Bindings

14. Un-Registration(1/2)  關閉 X-Lite, 可擷取到解除註冊的封包

15. Un-Registration(2/2) UA SIP Server REGISTER 401 Unauthorized REGISTER 200 OK 0 Bindings Un-Register  0 bindings  no contact Register  1 bindings  contact

16. Difference  Contact List Request( 轉換 Number 使用 ) 新版 X-Lite  有做下線的動作 (Expires=0) 舊版 X-Lite  沒有下線的動作，直接要求註冊  Un-Registration( 關閉 X-Lite) 新版 X-Lite  只需做兩個動作 ( 封包有夾帶認證資訊 ) 舊版 X-Lite  需要做四個動作 ( 沒有夾帶認證資訊，所以需重覆夾帶 一次 )

17. Unsuccessful Registration(1/2)  把 X-Lite 向 SIP server 註冊 的帳號及密碼故意填錯, 可 以擷取到註冊失敗的封包。 每２０秒會傳送一次 (default=20)  進入 System settings/ SIP Proxy/Default  設定（隨便填） Display Name Username Authorization User Password

18. Unsuccessful Registration(2/2) UA REGISTER 401 Unauthorized REGISTER 0 Bindings SIP Server 401 Unauthorized

19. SIP CALL 19

20. Architecture SIP Server 192.168.1.3:5060 1000/1000pwd 2000/2000pwd

21. REGISTER – X-LITE X-lite SIP Proxy 401:Unauthorized 200 OK Request: REGISTER

22. Register Unsuccessful X-lite SIP Proxy Request: REGISTER 401:Unauthorized Request: REGISTER 401:Unauthorized Request: REGISTER 401:Unauthorized

23. Unregister X-lite SIP Proxy 200 OK Request: REGISTER

24. Register – SJPHONE X-lite SIP Proxy Request: REGISTER 401:Unauthorized 200 OK Request: REGISTER

25. X-LITE CALL SJPHONE Call Establishment X-LITESIP PROXYSJPHONE INVITE 100 trying 200 OK ACK INVITE 180 Ring

26. X-LITE HANG UP X-LITESIP PROXYSJPHONE BYE 200 OK

27. X-LITE CALL SJPHONE No Answer X-LITESIP PROXYSJPHONE...... INVITE 100 trying INVITE 183 180 Ring

28. X-LITE CALL SJPHONE No Answer (New SJphone call Old X-lite) SJPHONESIP PROXYX-LITE INVITE 100 trying INVITE 180 Ring INVITE 180 Ring...... SJPHONESIP PROXYX-LITE 408 Request timeout CANCEL ACK 487 Request Term. 200 OK ACK

29. X-LITE CALL SJPHONE Ignore INVITE 100 trying INVITE 100 trying 486 Busy ACK 486 Busy ACK X-LITESIP PROXYSJPHONE 180 Ring

30. X-LITE CALL SJPHONE Cancel INVITE 100 trying INVITE X-LITESIP PROXYSJPHONE 100 trying CANCEL 200 canceling 200 OK 487 Request term. ACK 487 ACK 180 Ring

31. X-LITE CALL SJPHONE No Responsible INVITE 100 trying INVITE X-LITESIP PROXYSJPHONE 408 Request timeout ACK

32. X-LITE CALL SJPHONE Temporarily Unavailable INVITE 404 not found X-LITESIP PROXYSJPHONE

33. SIP CALL THROUGH 2 PROXIES PROXY 5060 PROXY 5061 192.168.1.3 192.168.1.1 REGISTER 2000 (PORT=5060)1000 (PORT=50600)

34. CONFIGURE  Configure a new ser.cfg cp /usr/local/etc/ser/ser.cfg \ /usr/local/etc/ser/ser1.cfg; Edit /usr/local/etc/ser/ser1.cfg; Find “!lookup(“location”) Add a new line with the content rewritehostport(“ : ”); Comment the next 2 lines. Save and exit your text editor.

35. CONFIGURE (cont.)  Execute the ser with default conf. file. ser  Execute the ser with modified conf. file. ser –f ;  Check your ser proxies is in running & listening. ps aux |grep ser; netstat –ntdl;

36. SJPHONEPROXY 5061PROXY 5060X-LITE SJPHONE CALL X-LITE INVITE 100 TRYING INVITE 100 TRYING 180 RINGING 200 OK INVITE 180 RINGING 200 OK