Here we can see a graphical SIP signalling handshake which is very useful if you want to determine where along the line the call fails. Really useful if you are troubleshooting voice calls and someone complains in voice quality. Hit decode to get the green stuff going, press From check box or somewhere in the green stuff press play to listen on the voice data collected for this session. Here we see one SIP call that has been made earlier, it is in status COMPLETED meaning that a successful call has been set up and there has probably also been some actual voice data transferred, you may press Player to eavesdrop on this call. Another useful way to use colour codes is to trace a certain conversation Right click packet > Colorize Conversation. You can also apply custom colours to specific conversations but right clicking on lines in the main window that belong to some sort of conversation e.g SIP, HTTP or RTP. Wireshark will also apply predefined color coding, you could of course customize your own colour codes. For example it will capture all UDP packets, but it will also look in the header of the UDP and try to automatically decode and classify it in a second level or different layer to determine what type of packet it really is. Wireshark will automatically try to analyze what type of protocol that is sent and classify it. Wireshark will start to capture everything, I will show you some examples that belongs to the voice realm. Uncheck the box to only receive packets destined for the interface-Press start when ready. This is default, promiscuous mode means that the sniffer will capture anything on the interface choosen. (note that there is also a Sample Captures button on the front page that can be useful if you want to download rerecorded dumps of different scenarios) But I assume that you have installed Wireshark and you are looking at this:Ĭhoose what interface you would like to monitor, then you might wanna have a look at Capture options and get familiar with them. but as usual I make my own just for learning reasons and personal documentation, no world is perfect and there is different angles that you never can predict thats why you always need to be open minded about stuff. There are plenty of good wireshark guides. I guess that is the right kind of motivation you need to dig deep down signalling and question the very bits and bobs that make our world operational. There is a lot of built in tools for us that are really helpful and I can’t help to think it’s actually quite fun to use. Wireshark is comprehensive free tool for VoIP troubleshooting and network analysis overall. Troubleshooting voice with Wireshark – Part 1
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