Listen to the call from RTP packets
- Open the capured packets with Wireshark
- Select [Statistics] > [VoIP Calls]
- In the popup window of detected calls, highlight the call you want to listen and click [Play] then [Decode]
- In the RTP Player window, select the dircetion of the call and play
Retrieve the ulaw data from captured packets
- Open the file by wireshark
- From menu bar, click [Statistics]>[RTP]>[Show all stream]
- From pop-up "RTP Streams" window, select the stream you want to retrieve and [Analyze] button
- From pop-up "RTP Stream Analysis" window, click [Save payload]
- At next window, select
[Format]: .raw
[Channels]: forward
[Selection:] text area: type in a file name end with .ul (such as: test.ul) - Click [ok] to save the RTP stream as .ul format
To convert ul file to wav file
- Download SoX sound exchange program from http://sox.sourceforge.net
- From command line, run "sox test.ul test.wav" to convert ul file to wav format