Difference between revisions of "Voice-only with different codecs"

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With WireShark data has been collected and the following filters are used in the in I/O-graph:
 
With WireShark data has been collected and the following filters are used in the 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
 
 
 
[[image:Wireshark-graph_GSM_G711_traffic_Bps.png]]
 
 
 
This does 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 measured 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-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-Red  : ip.src == 192.168.1.3  && ip.dst == 192.168.1.106

Revision as of 13:13, 23 February 2007

Experimental Setup

In order to gain inside in the bandwitdh usage when SIP-phones use different codecs, the following experimental setup is used. A voice-call has been established between SIP-phone 201, which uses the GSM-codec and SIP-phone 301, which uses the G711u-codec.

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 GSM G711 traffic Bps oneway-traffic.png

Legenda:

  • Blue: Traffic between the Asterisk-boxes.
  • Red: Traffic to and from SIP phone 301.
  • Pink: Traffic to and from SIP phone 202.
  • Green: Traffic to and from SIP phone 201.

Conclusions

  • Tsah