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    DAHUA VTH2421FB-P maximum ring volume too low

    Hello all I recently installed a DAHUA VTH2421FB-P in pair with VTO2111D-P-S2. All seems to work correctly but, after a firmware upgrade of VTH (which was OK) to version DH_VTHX421H_MultiLang_SIP_EMEA_V4.600.0000000.0.R.220819, I realize that the maximum ringing tone volume is decreased a lot...