Might sound like a stupid question. Have you tried turning up the volume after you have answered the phone?
I am sure the ringing volume and voice volume are separate.
2008 E92 335i M-Sport | Sapphire Black | Sunroof | Creme Beige | Poplar Grey | Logic 7 | 6AT | 19" AG M359's | Michelin PSS | LUX V3 | E85 | JB4 G5 ISO | Wedge Flash | Vishnu DCI | AR Design Catless DP's | Forge DV's | Helix IC | (Stock Cat. back) |