using some SNOM C520-wimi Software Version: 1.40.18-0-ENG.
Problem here seems that in small room with 3 people standing / sitting around the micro is too quiet.
Is there any Volume setting we can adjust ?
Maybe you can try a more recent firmware version, you can download it below:
File Name: C520-WiMi-1.40.32-0-ENG.img
Size: 5289084 bytes
Download URL: http://downloads.snom.com/fw/C520-WiMi-1.40.32-0-ENG.img