General Tech Information

Listen to the call from RTP packets

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

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