Voice only analysis

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Experimental Setup

Because it is impossible to measure data traffic between two VM ware's on the same machine, the following setup is used.

Schematic overview of all PC's running which software.

Results

With WireShark data has been collected and the following filters are used in the in I/O-graph:

Filter-Black: ip.src == 192.168.1.101 && ip.dst == 192.168.1.106
Filter-Red  : ip.src == 192.168.1.3   && ip.dst == 192.168.1.106
Filter-Green: ip.src == 192.168.1.189 && ip.dst == 192.168.1.101
Filter-Blue : ip.src == 192.168.1.106 && ip.dst == 192.168.1.101
Filter-Pink : ip.src == 192.168.1.100 && ip.dst == 192.168.1.101

Wireshark-graph G711 G711 traffic Bps oneway-traffic.png

Conclusions

  • From the graph shown above there can be concluded that the IAX2 traffic (black and blue line) uses less bandwidth than the SIP-traffic (red and green line). This is due to the IAX trunking which reduced the overhead.
  • We also filtered for traffic between all three SIP-telephones and no direct traffic was detected between them.