Graph the failed call, review the SIP methods and responses passed between your SIP proxy and the SBC of your carrier, and identify the source of the failure.

Select the specific failed call in the pop-up window that appears.ģ. Open the file that contains the packet capture and identify all VoIP calls within the capture by choosing StatisticsOVoIP Calls from the main menu bar. Continue to make test calls until you capture another failed call. If the call completes, then you have an intermittent issue.

Open a packet capture and redial the failing number. When troubleshooting a failed VoIP call with Wireshark, follow these steps:ġ. If you have a complex, least-cost routing configuration established, which routes calls by the area code and the first three digits in the phone number and includes roll-over to other providers if your primary VoIP carrier is maxed out, the Wireshark capture may be the only way to definitively identify which carrier processed the affected call. You might not know exactly which outbound port it took. You may not have direct access to this information without a capture. Your VoIP carrier requests specific information from you when you report the issue.

You can’t as easily identify call quality issues (for example, clipping, echo, and static) by using Wireshark, so either your carrier or your VLM software needs to pursue those issues. You can best use Wireshark to troubleshoot call completion issues. The more comfortable you are with pulling information in Wireshark and dissecting your calls, the more quickly you can resolve issues - and the less frustrated you feel. VoIP and Wireshark place the power in your hands. Even if you had SS7, you still had to have capture software and a technician who could make sense of it all. This visibility was restricted in the days before VoIP to only large customers who used SS7 signaling to connect to their carriers and large dedicated circuits equivalent to 672 phone lines. Wireshark allows you to see the messaging and signaling banter between your VoIP LAN and your carrier’s SBC.

Using wireshark to troubleshoot voip