VoIP over CUWiN mesh

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VoIP over CUWiN mesh

• Date of Submission May 14th, 2006
• Students Pushkar Ghayal, Tan Tan, Xiaoxi Shi
• Supervisor Professor Carol Davids

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VoIP

• Voice over Internet Protocol (VoIP) is the
  routing of voice conversations over the Internet
  or any other IP-based network.

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CUWiN

• Champaign-Urbana Community Wireless Network
  (CUWiN) has been developing a free, open source,
  turnkey wireless networking solution that can
  provides extremely high-speed, low-cost
  networking for every community and constituency.

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Wireless Mesh Architecture
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Topology Figure
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Interesting Fact

• PC registers to the Antenna.
• Antenna checks the MAC address of the PC and
  assigns it an IP address.
• While routing, antenna doesnt check the MAC
  addresses.
• We were able to exploit this. We used a PC to get
  an IP address and then configured ABACUS with
  this IP address.
• We had to do this as ABACUS doesnt support DHCP.

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Goal

• To test how well VoIP services operate over the
  CUWiN network under different environment.
  Configure several possible scenarios under which
  operate VoIP services and applications over the
  CUWiN mesh. Then capture and analyse the data we
  got.

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Testing

• 1.Set up CUWiN mesh network.
• 2. Connect the Abacus 5000 into our network.
• 3. Pretend the 2 port of Abacus 5000 as 2 nodes
  in our network.

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Configuration of Abacus 5000

• Abacus originates and terminates calls.

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Configuration of Abacus 5000
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Testing

• 4. Set up all the parameters of Abacus 5000.
• 5. Check the status of each channel.
• 6. Initiate 10 calls with RTP flows between the 2
  ports.

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Testing

• 7. Capture the information about SIP and RTP by
  ethereal in the call time.
• 8. Test the quality of the calls.
• 9. End the calls and create the quality report by
  Abacus 5000.

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Testing

• 10. Initiate 20, 50 calls and repeat the steps
  from step 3 to step 8.
• 11. Add traffic between the nodes which we
  created calls on and repeat the steps from step3
  to step 9.
• 12. Analyses all the data we get about the calls.

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Data Captured by Ethereal
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Report of the quality of the Calls
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Common Failures

• Connection Disconnect
• Unexpected Disconnection
• Both of them indicated the network is overloaded.

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Analysis
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Analysis
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Conclusion

• With the increase of the calls and the traffic in
  the network, the amount of dropped calls increase
  and the quality of the calls decrease.
• We have quantified the results.

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Future Tasks

• We want to test the effect of HSLS on SIP.
• We will reduce the power of the antennas and
  force a route change and observe the effect.

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Thank you

• Questions ?