For almost every issue it is important to see what the phone is processing. Therefore the Snom phone will provide those informations via Syslog.
With different log levels, you will be able to have a very complete analysis feature, standardized globally.
Depending on your Operating System in use, you might already have an application at hands. Here is a short list of available tools:
Most of the Linux distributions are offered already with a syslog server bundled. Usually the default Syslog configuration doesn't allow to receive logs from the network. Refer to your Linux distribution or syslog daemon how to enable the network listening and how to configure the service
You may also consider to use some hosted / cloud service to collect your Syslog messages. Just some examples here:
Enter the IP address of the device which is running the Syslog Server, as soon as you "Apply" you should see incoming messages in the TFTPD / Syslog Server
Hint: Setup your PC as a pseudo Syslog for better Wireshark log
If you want to troubleshoot your deskphone or just want to check, if everything works correct, there is a good way to let the Snom Deskphone send every network Data to your PC. There you can log everything in a Wireshark File and analyse it. There are two ways to do so.
Please change the IP to your local PC.