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Troubleshooting not able to make VoIP calls with wireshark

03/26/2020 61 People found this article helpful 198,970 Views

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    Description

    Troubleshooting not able to make VoIP calls with wireshark

    Resolution

    Problem

    Clients behind the Sonicwall are not able to make VoIP calls

    Troubleshooting

    1. Run a packet capture on the Sonicwall and monitor for the source IP address and the destination IP address for the VoIP call.
    2. Export the packet capture as a Libpcap file as shown in the screen shot below.

    Image

    3. Run the pcap extension file downloaded in Wireshark.

    4. The screenshot below shows what a successful call setup and teardown should look like in Wireshark.
    Image


    To inspect the traffic flow for a call set up, select VoIP Calls from the Telephony menu, choose a call and click on Flow.

    5.The screenshot below shows a typical SIP-initiated conversation.

    Image

    Calls can fail for the most obscure reasons.For example, some SIP gateways might expect some of the call
    setup information in one format, while another part of the SIP infrastructure provides it in a different one.

    6. The screenshot below shows a SIP invite request packet.
    Image


    Within the header, the Allow property is displayed, in this case with all elements on one line. But if another part of the 
    infrastructure expects them as different elements, the call might fail. The most practical way you can troubleshoot
    this type of problem is by inspecting the packets in Wireshark to figure out the issue with the SIP call.

    7. To search for SIP error codes in a Wireshark capture enter the following filter: sip.Status-Code >= 400

    Image


    For a detailed explanation of SIP Code errors click here.


     

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