if you use wireshark to check this error you see a tftp timeout and you thing there is a "network problem"
>> this was not the case in my case. The problem was a audio problem.
After I reset the audio settings to default and rebooted the machine the problem was gone

> there is a tool that is called "collect data", that comes with the softphone client software. You can use this tool to analyse the error, just press windows button and enter "collect data" to find and start the tool!

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