Hallo Michael,
hab dazu folgendes gefunden in der SNOM Wiki.
V6: Advanced - Audio (Section): Casing Mic Volume (1 - 8)
V7: Advanced - Audio (Tab) - Audio(Section):Casing Mic Volume (1 - 8)
V8: Advanced - Audio (Tab) - Audio(Section):Casing Mic Volume (1 - 8)
N/A
<vol_speaker_mic perm=“PERMISSIONFLAG”>VALIDVALUE</vol_speaker_mic>
DESCRIPTION
Adjust the casing microphone volume. It may be possible to reduce an existing echo by decreasing this value.
VALIDVALUE
1…8
DEFAULTVALUE
4
Evtl. hilft es dir ja weiter.
Grüße
Andi