First, the computer on which Wireshark is installed must be connected to a port on the network, and second, this network port must be configured appropriately to send the voice packets to the computer for analysis. ![]() In order for Wireshark to capture VoIP packets, there are two fundamental requirements. How do you capture voice packets using SPAN? In this article, we’ll focus on how to prepare your network for capturing VoIP packets using Wireshark. But once you get the hang of it, you will truly see what a powerful tool it is and it will quickly become one of the primary instruments in your troubleshooting toolbox. Wireshark as a tool can be intimidating at first, and I know this because this was the case for me. Well, barring X-ray vision as a solution, the next best thing is to use a packet sniffer such as Wireshark to be able to look at the “sub-packet” level of the network for VoIP troubleshooting. These are questions I wish I had instant access to, and this is what port mirroring is all about. What kind of signaling is getting through and what is being blocked and where? When you experience voice quality issues, one way or choppy voice, or call setup problems, it would be great to be able to see, are the voice packets arriving? How are they arriving? ![]() It would be so advantageous to be able to instantaneously see what is going on with transmissions on the network. ![]() When I encounter a problem on a VoIP network that needs troubleshooting, I just wish that I had microscopic X-ray vision, like a superhero who is able to peer into the subatomic level of things.
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