Most of these services are usually based on Bluetooth connectivity, letting the drivers connect their mobile phones to the car's audio system and answer a call by pressing a single button on the dashboard.
However, it seems like a possible solution that could solve the aforementioned problem comes from a non-car manufacturer: the Canadian company AegisMobility introduced DriveAssist, a new software which works with your network operator and acts just like a real secretary.
The key feature of this service is the Aegis ContextEngine which sends signals whenever you're in motion, driving a car or traveling as a passenger. Every time somebody calls you, DriveAssist intercepts the call and gives the caller three options: record a voice message, leave a SMS message or find out the driver's location. In case you're wondering how does it do that, DriveAssist connects to the mobile phone navigation system, if available, or uses mobile signal to get the coordinates of the driver.
“The DriveAssist software running on the subscriber’s mobile phone automatically determines the driving context of the user. Once it's sure that you're driving the software signals to the Aegis ContextEngine that you're in motion. All calls and all text messages outbound are then mediated from the mobile network, except for 911 calls which are automatically accepted,” AegisMobility explains on the official website of the company.
Beside all these features, DriveAssist allows the caller to bypass the restriction by indicating that the call is an emergency. In addition, 911 calls are automatically allowed while car passengers can override the service and remove the restriction. More importantly, in case somebody sends you a text message, it is automatically resent to the mobile operator and transferred to you once you stop the car.