The Du Pont-Dabba system is based on advanced VoIP (Voice over IP) technology. It has so far been installed in 52 high-rise buildings in the two cities where it is also used to provide security access control in the buildings. The buildings have been wired to connect each flat to a central control unit which, in turn, is connected via a wireless link to Du Pont's carrier-strength TELES Class 5 technology-based network.
A telephone handset provided in each flat serves as an intercom which residents use to admit visitors to the building. Residents can then purchase Dabba airtime vouchers, allowing them to make voice calls from the flat's handset or to access the Internet.
Du Pont CEO Graeme Victor says people living in high-rise, high-density areas generally can't obtain fixed-line telephones in their flats. They therefore have to use prepaid cellphones for voice calls and prepaid 3G for internet access - both of which are extremely expensive. "By using Dabba prepaid vouchers, their call and internet access costs are considerably reduced. International calls to other African countries are around 60% cheaper, a huge benefit to the many migrants who live in these buildings," he says.
While the system was originally developed to bridge the digital divide in areas without access to conventional telecommunications infrastructure, it is also starting to find favour in other high-density developments such as gated communities and office parks.
