With appropriate equipment, users will be able to see who is ringing the doorbell at home, via the mobile phone. They can then talk to the person, and for example open the door to a handyman, according to Nokia.

Nokia's first systems are expected to become commercially available by the end of 2009, said Toni Sormunen, director for the Smart Home Program at Nokia.

The heart of the Nokia system is the Home Control Center (HCC), a piece of hardware which will act as gateway between different systems for home automation and the mobile phone, or any device that is equipped with a browser.

Phones will talk to the HCC via an Internet connection or Wi-Fi. Nokia has developed a native client for phones running its Symbian S60 software, and a browser-based client for other devices.

Using the native client users will be able to plug the phone into the HCC with a USB cable, and everything is installed automatically. The native client will also be more responsive, and users won't have to log in when they access their HCC, according to Kari Rantanen, director of sales and marketing at Nokia's Smart Home Program.