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How-to start a packet capture

Description

This article explains how to start, stop, and download a packet capture within the CoCoS platform.
A packet capture allows you to record network traffic so you can analyze protocols such as SIP and RTP. Packet captures are often used to diagnose call quality issues, signalling behaviour, or general network irregularities.

Application

Packet captures are typically used when analyzing network behaviour.
Examples include:

  • Verifying SIP signalling sequences

  • Inspecting RTP audio streams

  • Identifying latency, jitter, or packet loss indicators

  • Troubleshooting firewall or routing behaviour

How To

Packet captures can be created directly from the Network section in CoCoS. The steps below explain how to perform a quick capture or how to configure a custom capture.

Step 1: Open the Packet Capture page
Navigate to System → Network → Packet Captures in the CoCoS application menu.

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Step 2: Start a capture
You can choose between two options:


• Quick Capture: Starts an immediate capture using the default settings.


• New Packet Capture: Opens a configuration window where you can select advanced options such as the network interface or capture filters. Example:

 

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Step 3: Stop the capture
Once the capture has started, use the Stop action to end the recording. Captures can run until manually stopped or until predefined limits are reached.

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Step 4: Download the capture
After the capture has stopped, click the Download action to save the capture file. The downloaded file can be opened with standard analysis tools such as Wireshark.

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