Polycom VVX 400/410 - Changing the Volume
Changing the Speaker Volume
To change the volume of what you hear during a call, press one of the Volume keys, 
, to lower or raise the speaker volume.
, to lower or raise the speaker volume.Changing the Ringer Volume
To change the volume of the incoming call ringtone, press one of the Volume keys, 
, while your phone is idle or ringing.
, while your phone is idle or ringing.