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SIP-based VoIP Lab

SIP-based VoIP Lab. Step 1: Connect Your PC to The Network. Get your laptop connected to the campus WLAN. Run ipconfig to show your own IP address Ping NCNU.SIP.voip.edu.tw (163.22.21.82) Ping voipgw.ncnu.edu.tw (163.22.9.227). 11 – 10.10.19.165 12 – 10.10.19.188 13 - 10.10.19.71

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SIP-based VoIP Lab

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  1. SIP-based VoIP Lab

  2. Step 1: Connect Your PC to The Network • Get your laptop connected to the campus WLAN. • Run ipconfig to show your own IP address • Ping NCNU.SIP.voip.edu.tw (163.22.21.82) • Ping voipgw.ncnu.edu.tw (163.22.9.227)

  3. 11 – 10.10.19.165 12 – 10.10.19.188 13 - 10.10.19.71 14 – 10.10.19.170 15 – 10.10.19.121 10 – 10.10.19.4 P204S (WiFi) 16 – 10.10.19.47 17 – 10.10.19.199 18 – 10.10.19.164 19 – 10.10.19.94 20 – 10.10.19.85 IP Addresses We Obtained

  4. Step 2: Install Ethereal under Windows • Install Wireshark 1.4.1. • It will automatically install WinPcap. • Install WinPcap 4.1. • WinPcap is an architecture for packet capture and network analysis for the Win32 platforms. • It includes • a kernel-level packet filter, • a low-level dynamic link library (packet.dll), and • a high-level and system-independent library (wpcap.dll, based on libpcap version 1.1.1)

  5. Where to Get Wireshark • Official site: • http://www.wireshark.org/download.html

  6. Step 3: Install a SIP UA • Windows Messenger 4.7 (4.7.2009) • Windows XP SP2 will remove the SIP support in Messengers • Windows Messenger 5.1 • X-Lite 3.0 • Linphone • Act-Tel WiFi phone

  7. Step 4: REGISTER • Configure the proxy server to be • NCNU.SIP.voip.edu.tw (163.22.21.82) • Start your Ethereal • Disable promiscuous mode • Capture Filter: udp port 5060 • Display the captured packets in real-time • OK • Start X-Lite • Sign-in and observe the packets you capture

  8. HTTP-Digest on SIP 9

  9. Ex 1: • Everybody sign-in and sign-off to see the SIP messages. • Sign-in • Expires: 3600 • Sign-off • Expires: 0 • Ex 2: • Two UAs sign in with the same username. • 2 Bindings • One UA signs off • 1 Binding • The other UA signs off • 0 Bindings

  10. Now everybody restores to your original username. • Keep Wireshark running.

  11. Test Your Microphone & Speaker

  12. Call Scenarios • Practice using this tool to capture SIP signaling in the following call flows • REGISTER – 200 OK • INVITE – 200 OK – ACK • INVITE – CANCEL – 200 OK - ??? – ACK • INVITE – Decline (???) - ACK • BYE – 200 OK • Hold/Retrieve

  13. INVITE • Pairing students into groups • Let the student with lower username be the caller, and the other student be the callee. Make the call. • Exchange the role, and make the call again. • Call instructor’s X-Lite • 20001@NCNU.SIP.voip.edu.tw • Call NCNU PBX • 4161 (COM), 4131 (CSIE) • 4161@voipgw.ncnu.edu.tw • Compare the signaling flow of the above two cases

  14. Via • On The receiver side, observe the Via header field of a request, and compare it with the Via header field which was generated by the sender. • Also observe the difference of the Max-Forwards header field.

  15. Try to capture RTP packets • Open a new Wireshark • The old one is still running to capture SIP signaling. • Capturing Filter: udp • You will obtain 50 packets in a second • Analyze – Decode As – RTP • Can you choose a different codec?

  16. X-Lite • INVITE/200 OK/ACK • BYE/200 OK • Hold/Retrive • RTP

  17. SIP Forking • Ex 1: • A calls B, C. • B answers. • C receives a CANCEL request. • Ex 2: • B calls A, C • Nobody answers. • C hangs up.

  18. Contact List • Presence • SUBSCRIBE/NOTIFY • RFC 3265 • Instant Message • MESSAGE • RFC 3428

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