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Skype Traces

The following traces (libpcap consistent) which are available for the research community, contain Skype traffic only. Traces have been collected and organized with the support of the RECIPE (Robust and Efficient traffic Classification in IP nEtworks) and MIMOSA (MIsure sperimentali e MOdelli di traffico dati multiServizio A pacchetto) projects.

Skype Testbed Traces

In order to characterize Skype calls traffic, we made up a testbed in laboratory, compounded by two hosts running Windows XP, connected to internet through a router. In these conditions, several sintetic traces have been generated, according to characterize Skype calls through their vocal codecs. Only most significant traces are available in gzip format.

Skype E2E Traces

Calls type L4-protocol Voice codec Info codec Start time End timeL4-payload size per packet Download Trace File size
Skype E2E voice only UDP GIPS iSAC For more information about the iSAC codec, look here 2006-06-26 10:37:46 CET 2006-06-26 10:56:22 CETAll Download8.3 MB
Skype E2E voice only UDP SVOPC For more information about the SVOPC codec, look here 2008-01-11 12:37:00 CET 2008-01-11 12:42:15 CETAll Download 4.6 MB
Skype E2E voice only UDP GIPS iLBC For more information about the iLBC codec, look here 2006-06-14 10:25:08 CET 2006-06-14 10:41:52 CETAll Download 6.0 MB
Skype E2E voice only UDP GIPS iPCM-wB For more information about the iPCM-wb codec, look here 2006-06-14 11:38:16 CET 2006-06-14 11:52:55 CETAll Download 24 MB
Skype E2E voice only UDP ITU-T G729 For more information about the G729 codec, look here 2006-06-14 11:21:56 CET 2006-06-14 11:37:01 CETAll Download 3.8 MB
Skype E2E voice only UDP EG711 (A-law) EG711 is an Enhanced version of the ITU-T G.711 codec2006-06-15 10:51:26 CET 2006-06-15 11:06:44 CETAll Download 22 MB
Skype E2E voice only UDP EG711 (u-law) EG711 is an Enhanced version of the ITU-T G.711 codec 2006-06-15 10:35:26 CET 2006-06-15 10:49:41 CETAll Download 22 MB
Skype E2E voice only UDP PCM (A-law) 2006-06-15 11:22:35 CET 2006-06-15 11:37:18 CETAll Download 16 MB
Skype E2E voice only UDP PCM (u-law) 2006-06-15 11:07:53 CET 2006-06-15 11:21:28 CETAll Download 16 MB
Skype E2E voice only TCP GIPS iSAC For more information about the iSAC codec, look here 2006-09-25 14:21:38 CET 2006-09-25 14:37:01 CETAll Download 7.3 MB

SkypeOut Traces

Calls type L4-protocol Voice codec Info codec Start time End time L4-payload size per packet Download Trace File size
Skype SkypeOut call UDP G729 In this case, a PSTN-user located in Torino, was contacted2006-09-26 09:09:56 CET 2006-09-26 09:25:06 CETAll Download 3.8 MB
Skype SkypeOut call TCP G729 In this case, a PSTN-user located in Torino, was contacted2006-05-26 12:40:54 CET2006-05-26 12:56:14 CETAll Download 4.8 MB

Traces from Real Internet Traffic

The following traces contain network traffic captured on main link of Politecnico di Torino. People that have access to our campus link are students, researchers, professors and administration staff.

Starting from a 96-hours trace captured on our campus main link, Tstat was successfully able to classify traffic packets generated by the most popular voice over Internet application, called Skype. Classification of Skype's calls has been possible thanks to research activities described into "Revealing skype traffic: when randomness plays with you". For better usage, Skype's connections classified by Tstat, are separated into more traces, depending on kind of traffic (End-to-End calls, SkypeOut calls, signaling connections) and L4-protocol used. As previously, in order to respect privacy, IP addresses have been anonymized.

  • Data Start Time: 2006-05-29 10:01 CET
  • Data End Time: 2006-06-02 10:00 CET
  • Data Duration: 96 hours about

Skype Traces

Type L4-protocol L4-payload size per packet Download Trace File size
Skype E2E voice only and voice+video calls UDPmax 38 Byte Download1.3 GB
Skype Skype Out calls UDPmax 38 Byte Download67 MB
Skype Signaling connections only UDPmax 38 Byte Download 2.2 GB
Skype E2E and SkypeOut calls TCP max 26 Byte Download55 MB
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