2N Helios IP Configuration Manual page 43

Adaptive volume – enable the adaptive volume mode in which the speaker
volume is adjusted automatically depending on the noise level of the intercom
installation site.
Maximum gain – set the maximum gain to be applied to the master volume in
the adaptive mode.
Sensitivity threshold – set the ambient noise threshold at which adaptive gain
is applied.
Current noise level - display the current ambient noise level.
Current adaptive gain - display the current adaptive gain of the master
volume. The value is determined by the difference of the Current noise level and
Sensitivity threshold and never exceeds the Maximum gain value.
Ringtone volume – set the incoming call signal loudness.
Call-progress tone volume – set the dial, ring and busy tone volume. In case
the call-progress tones are automatically generated by the PBX, this setting will
not be applied.
Key beep volume – set the key beep volume. The volume values are relative
against the set master volume.
Warning tone volume – set the volume of warning and signalling tones
described in the Signalling of Operational Statuses section. The volume
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