Wireshark is an open source tool that allows you to capture and analyze network traffic in real time. It supports a wide variety of network protocols and its usefulness goes beyond diagnosing connectivity problems, being an important resource for optimizing networks, including VoIP networks.
In the context of VoIPWireshark offers an in-depth view of the SIP (Session Initiation Protocol) and RTP (Real-time Transport Protocol) protocols to diagnose and resolve problems. In SIP, it allows you to quickly identify problems - from negotiation failures to protocol configuration issues. As for RTP, it allows you to diagnose possible sound problems, such as the famous one-way audio1, as it offers the functionality of playing audio streams.
In the "Telephony" section, you can choose the VoIP Calls filter, which allows us to isolate the relevant packets for VoIP troubleshooting, thus simplifying the analysis and speeding up the resolution process. You can check the call path and the call signaling.
In this section, you can also choose the RTP Streams option, which allows you to audit the conversation and identify possible anomalies between the two terminals.
Wireshark stands out for being an indispensable troubleshooting tool - not only locally, but also in the RCTS VoIP network - providing proactive resolution of existing problems and anomalous patterns after regular network captures.
1One-Way Audio: This refers to a situation in which the audio of a communication is only transmitted in one direction.