If PCAP traces bigger than 500 KB are needed, the internal PCAP trace functionality of the Snom deskphone cannot be used due to its storage space limitation.
There are two ways to capture large PCAP traces: on a PC or a USB mass storage device.
You will need to make sure all packets to and from the phone also reach the PC, which can be achieved by:
Once you have all packets reaching the PC, you can capture them in one the following ways, depending on whether you are using Windows, Linux or Mac OSX:
Install tcpdump and run as root using command:
Where dump.pcap is the saved PCAP trace and eth0 is the network interface.
Alternatively you can store the PCAP trace on a USB thumb drive. The duration of the trace depends on the storage size of the USB thumb drive.
You can find the instructions for this method here: How to store a PCAP trace into an USB mass-storage device