Lab Hours. We need to allocate 3 hours in this week for hands-on lab hours ( Nov 13 th 14:10-17:00).

Transcription

1 Lab Hours We need to allocate 3 hours in this week for hands-on lab hours ( Nov 13 th 14:10-17:00). 17:00). The instructor will set up the SIP server. Every student will bring a labtop or desktop PC and install a SIP UA (softphone( softphone). It will be even better if you have a WiFi-phone. Packet analyzer will be utilized to capture and analyze the SIP messages. 1 TAC2000/2000

2 LABORATORY 117 SIP UAs and SIP Message Analysis Quincy Wu National Chi Nan University 2 TAC2000/2000

3 Exercise 1: SIP UA operations Download & Install SIP UA Download & Install Ethereal Packet Analysis Using Ethereal SIP signaling flow RTP traffic SIP headers SDP Contents Call Hold/Retrieve 3 TAC2000/2000

4 Windows-based SIP UA Microsoft Windows Messenger X-Lite 4 TAC2000/2000

5 SIP UA Windows Messenger By default, Windows XP installs Windows Messenger Version 4.7 There are two messengers from Microsoft MSN Messenger 6.2, 7.0 Windows Messenger 4.7, 5.1 Inside Windows Messenger - How it Communicates nol/winxppro/evaluate/insid01.mspx 5 TAC2000/2000

6 Step 1: Configure 6 TAC2000/2000

7 Step 2: REGISTER 7 TAC2000/2000

8 Step 3: Make A Call 8 TAC2000/2000

9 Step 4: Ringing 9 TAC2000/2000

10 Step 5: Conversation 10 TAC2000/2000

11 Step 6: Answer A Call 11 TAC2000/2000

12 SIP UA - X-Lite X-Lite - The Best Free Softphone A FREE premium SIP softphone with many PBX-like features. Open standards-based design (SIP) allows for maximum network interoperation and integration. Download from TAC2000/2000

13 Features Touch-tones [DTMF] 3 Lines, Multiple Proxies Line Hold Inbound Call 'Ignore' Inbound Call 'Go to Voic ' Dial/ Redial/Hangup Caller ID [SIP ID] Call Timer Mute Microphone & Speakers Levels Microphone & Speakers Meters Recent Calls Dialed Recent Calls Received Speed Dial G.711u+a/iLBC/GSM codecs NAT/Firewall support Specify NAT IP to be written in SIP messages Supports Windows 98SE/NT4/ME/2000/XP 13 TAC2000/2000

14 Step 1: Configuration 14 TAC2000/2000

15 Where to Get X-lite Xten-Win m.exe (2.0) (3.0) 15 TAC2000/2000

16 Step 2: Make/Receive Calls Automatically send a REGISTER request to registrar when the program starts up. Dial digits, and domain realm will be appended automatically. 16 TAC2000/2000

17 Packets Capturing & Analyzing 17 TAC2000/2000

18 Ethereal What Is It? Every network manager at some time or other needs a tool that can capture packets off the network and analyze them. In the past, such tools were either very expensive, proprietary, or both. With the advent of Ethereal, all that has changed. "A rose by any other name would smell as sweet." - William Shakespeare 18 TAC2000/2000

19 Features of Ethereal Available for UNIX and Windows. Capture and display packets from any interface on a UNIX system. Display packets captured under a number of other capture programs: tcpdump Network Associates Sniffer and Sniffer Pro NetXray Microsoft Network Monitor Filter packets on many criteria. Colorize packet display based on filters Allow people to add new protocols to Ethereal. 19 TAC2000/2000

20 Where to Get Ethereal Official site: 20 TAC2000/2000

21 Install Ethereal under Windows Install WinPcap 3.1. WinPcap is an architecture for packet capture and network analysis for the Win32 platforms. It includes a a kernel-level level packet filter, a a low-level level dynamic link library (packet.dll( packet.dll), and a a high-level and system-independent library (wpcap.dll( wpcap.dll,, based on libpcap version 0.6.2) Install Ethereal TAC2000/2000

22 Capturing packets with Ethereal Starting Ethereal 22 TAC2000/2000

23 Capturing packets with Ethereal 23 TAC2000/2000

24 The Capture Preferences dialog box 24 TAC2000/2000

25 Stop after you have collected enough packets 25 TAC2000/2000

26 File Save As 26 TAC2000/2000

27 Show Packet in New Window 27 TAC2000/2000

28 Capture Filters 28 TAC2000/2000

29 Filtering While Capturing 29 TAC2000/2000

30 IP Telephone Lab Syntax of the tcpdump capture filter language tcpdump filter language is explained in the man page. 30 TAC2000/2000

31 Capturing SIP signaling (filter: udp port 5060) 31 TAC2000/2000

32 SIP Call Establishment It is simple, which contains a number of interim responses. 32 TAC2000/2000

33 Basic Call Flow 33 TAC2000/2000

34 34 TAC2000/2000

35 35 TAC2000/2000

36 36 TAC2000/2000

37 REGISTER 37 TAC2000/2000

38 200 OK 38 TAC2000/2000

39 INVITE 39 TAC2000/2000

40 SDP in INVITE 40 TAC2000/2000

41 200 OK 41 TAC2000/2000

42 SDP in 200 OK 42 TAC2000/2000

43 ACK 43 TAC2000/2000

44 MESSAGE 44 TAC2000/2000

45 SUBSCRIBE/NOTIFY 45 TAC2000/2000

46 Capturing the packets of Media Data 46 TAC2000/2000

47 RTP Traffic (udp port 8000) What s s wrong? 47 TAC2000/2000

48 Tools Decode As RTP 48 TAC2000/2000

49 Display Filter 49 TAC2000/2000

50 Hold/Unhold of X-Lite 50 TAC2000/2000

51 Hold 51 TAC2000/2000

52 Retrieve 52 TAC2000/2000

53 Summary We demonstrate the functions of Windows Messenger and X-X Lite,, which are two SIP User Agents with friendly user interface. We demonstrate the functions of Ethereal, which is a powerful tool for packets capturing & analyzing: Capture Filters Colorized Packets Practice using this tool to capture SIP signaling in the following call flows REGISTER 200 OK INVITE 200 OK - ACK BYE 200 OK Hold/Retrieve 53 TAC2000/2000

54 NTP VoIP Platform W LAN Gateway Call Server Media Gateway Station Interface NCTU PBX Trunk Interface Phone W LAN User WLAN AP Station Interface Campus Network Hsinchu Edge Route TANet SIP Phone SIP Phone SIP Phone Phone Phone Phone Phone PSTN Edge Route Call Server Media Gateway Station Interface PU PBX Trunk Interface Taichung Adm in C onsole Campus Network Station Interface Phone SIP Phone SIP Phone Phone Phone Phone Phone TAC2000/2000