To my knowledge this is working as designed and is governed by international / national laws.
There are parameters that can manually adjust the phone's volume levels but you would need to raise a ticket via your Polycom reseller in order for our support team to advise you on the levels and make you aware that changing these may violate above laws.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Polycom Global Services
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The title Polycom Employee & Community Manager is an automatic setting within the community and any forum reply or post is based upon my personal experience and does not reflect the opinion or view of my employer. Poly employee participation within this community is not mandatory and any post or FAQ article provided by myself is done either during my working hours or outside working hours, in my private time, and maybe answered on weekends, bank holidays or personal holidays.