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 has been made.

Schematic overview of all PC's running which software.

Legenda:

  • Black: Traffic between the Asterisk-boxes in one direction.
  • Blue: Traffic between the Asterisk-boxes in the other direction.
  • Red: Traffic to and from SIP phone 301
  • Green: Traffic to and from SIP phone 201.
  • Pink:


Used filters 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

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). We also filtered for traffic between all three SIP-telephones and no traffic was detected.