Siemens Communication Devices (CD), a division of Siemens Information and Communication Products (Siemens ICP), develops and manufactures analog and digital communication terminals, especially digital enhanced cordless telecommunications (DECT) products, digital GSM-handsets and wireless network access terminals for GSM worldwide. Siemens holds a leading position in the digital wireless market, with around 100 mobile networks installed in 56 countries. Siemens handsets are used in nearly all the countries that have adopted the GSM standard. Moreover, Siemens CD is the leading provider of DECT-based products, having shipped more than fifteen million DECT phones throughout forty countries in the world. For the North American market Siemens patented WDCT, the worldwide digital cordless technology. WDCT is a derivative of the DECT standard, operates at the 2.4 GHz frequency and provides unprecedented digital cordless calling capabilities. Finally, Siemens CD develops and manufactures various corded phones and fully featured terminals, payphones, integrated services digital network (ISDN) products, e.g. digital videophones and PC-cards for innovative applications with voice, data and images.