There is quite a bit of information in a typical SIP conversation and often times troubleshooting involves figuring out obscure differences between the server and the gateway SIP implementation. But every one of them starts with this simple collection process. There are a lot of valuable functionality in Wireshark such as decoding the audio from the call, viewing ladder diagrams of the conversation, complex filtering rules€¦ There is a lot in there. By expanding the "Session Initial Protocol" section for the first packet we can see the INVITE header that was sent to the gateway. It is this lower area where you can see the actual SIP traffic details. The lower section shows the contents of the selected packet from above. 6) The top section shows a summary of each packet including the time, source and destination.
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