Konftel 300wx and SNTP/NTP setup?

Question

VoIP

Good day!
There is a problem with Konftel 300wx and NTP setup. I set up NTP (IP, etc.) through the web interface, the time is “pulled up” on the DECT station, but not on the speaker itself, after each reboot, the time goes astray and you have to set it manually. I dug through all the settings, but nowhere is there any time synchronization on the conference phone. Tell me, can there be a way to set up synchronization not only on the DECT station, but also on the phone itself?
Thanks in advance!