Voice-only with different codecs

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Revision as of 18:12, 20 February 2007 by Rubzzzz (talk | contribs)
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Experimental Setup

In order to gain inside in the bandwitdh usage when SIP-phones use different codecs, the following experimental setup is used.

Schematic overview of all PC's running which software.

Voice-call between 201 (GSM-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

Used filters in I/O-graph: 

Filter-Black: proto=sip
Filter-Red  : ip.addr == 192.168.1.3   && ip.addr == 192.168.1.106
Filter-Green: ip.addr == 192.168.1.189 && ip.addr == 192.168.1.101
Filter-Blue : ip.addr == 192.168.1.106 && ip.addr == 192.168.1.101
Filter-Pink : ip.addr == 192.168.1.100 && ip.addr == 192.168.1.101

Wireshark-graph GSM G711 traffic Bps.png

This doe not tell us which Asterisk box makes the conversion between the GSM codec and the G711u codec. Therefore we made another graph with the traffic meassured only in one direction.

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 GSM G711 traffic Bps oneway-traffic.png

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