iOS 4.1 brings AVRCP stereo Bluetooth control
Apple implemented the Audio/Video Remote Control Profile (AVRCP) into iOS 4.1.
This AVRCP is a mechanism which allows Bluetooth headsets and car dashboards to take control of the device’s audio functions they are connected to.
With this new implementation you can skipp forward, backward and volume and use the playback switches on their support handsets.
On this iOS 4.1, volume is accesible and allows users to control their Bluetooth headset instead of use their phone while driving.