2N Omega Lite - Configuration Tool manual v1.8 - Manual (Page 28)

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Permission for Modem switch for telemonitoring in the DISA detection is
(according to the ringing table) selected (if it is sited) directly in the modem module.
2.1.16. GSM Call Volume Levels
The table helps adjust the automatic call volume through a GSM module
against other interfaces.
The values are in dB.
Take small steps while changing the settings.