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Listen to the call from RTP packets

  1. Open the capured packets with Wireshark
  2. Select [Statistics] > [VoIP Calls]
  3. In the popup window of detected calls, highlight the call you want to listen and click [Play] then [Decode]
  4. In the RTP Player window, select the dircetion of the call and play

Retrieve the ulaw data from captured packets

  1. Open the file by wireshark
  2. From menu bar, click [Statistics]>[RTP]>[Show all stream]
  3. From pop-up "RTP Streams" window, select the stream you want to retrieve and [Analyze] button
  4. From pop-up "RTP Stream Analysis" window, click [Save payload]
  5. At next window, select
    [Format]: .raw
    [Channels]: forward
    [Selection:] text area: type in a file name end with .ul (such as: test.ul)
  6. Click [ok] to save the RTP stream as .ul format

To convert ul file to wav file

  1. Download SoX sound exchange program from http://sox.sourceforge.net
  2. From command line, run "sox test.ul test.wav" to convert ul file to wav format