2N Helios IP Configuration Manual v2.8.1 - Manual (Page 41)

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Audio AGC enabled – enable the automatic gain control of the line signal.
Audio volume – set the phone call volume. The volume values are relative
against the set master volume.
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
section. The volume Signalling of Operational Statuses
values are relative against the set master volume.
Switch activation tone volume – set the volume of the switch activation tone.
The volume values are relative against the set master volume.