VMG8825-T50 incorrect dial tone

Is it possible to set correct VoIP dial tone for Czechia on VMG8825-T50? The device is EU version, not customized.
Region Setting CZE - Czech Call Service Mode Europe Type, but the tone is wrong.
When I set Region GBR - UK I can hear correct UK dial tone!
Czech dial tone is atypical, it is repeated Morse letter A (330 ms 425 Hz, 330 ms silence, 660 ms 425 Hz, 660 ms silence).
Same tone is used in Slovakia.

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