Voice only analysis

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Experimental Setup

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

Schematic overview of all PC's running which software.

Voice-call between 201 (G711u-codec) and 301 (G711u codec)

  • Traffic to and from Ext. 201 is Green
  • Traffic to and from Ext. 301 is Red
  • Traffic between Asterisk-boxes is Blue in one direction and black in the other

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.