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

Outline  Observation of Call Flow SIP Registration SIP Call 2

OBSERVATION OF CALL FLOW 3

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

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

SIP REGISTRATION 6

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

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

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

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

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

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

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

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

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

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 )

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

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

SIP CALL 19

Architecture SIP Server : /1000pwd 2000/2000pwd

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

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

Unregister X-lite SIP Proxy 200 OK Request: REGISTER

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

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

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

X-LITE CALL SJPHONE No Answer X-LITESIP PROXYSJPHONE INVITE 100 trying INVITE Ring

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

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

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

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

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

SIP CALL THROUGH 2 PROXIES PROXY 5060 PROXY REGISTER 2000 (PORT=5060)1000 (PORT=50600)

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.

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;

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