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DECT (Digital Enhanced Cordless Telephone) as the name suggests is a standard for digital and cordless communication of voice and multimedia traffic using frequencies in the 1.8 GHz - 1.9 GHz range.
DECT was developed by ETSI but has now been adopted by countries all over the world. In Europe the DECT frequency is 1880 MHz - 1900 MHz and outside Europe, in 2005 the channel was changed to 1920 MHz - 1930 MHz or 1.9 GHz.
These channels are reserved for voice communication applications and are therefore less likely to interfere with other wireless technologies, such as wireless networks.
DECT cordless phones work by connecting to a base station, which may support one or multiple handsets. DECT bridges the gap between cordless phones and wireless, cellular phones, as each base station in effect creates its own short range cell.
DECT handsets automatically search for the highest quality connection and switch to it, so the connection clarity is always high quality.
According to Wikipedia DECT is:
"Digital Enhanced Cordless Telecommunications (DECT), known as Digital European Cordless Telephone until 1995, is an ETSI standard for digital portable phones (cordless home telephones), commonly used for domestic or corporate purposes. It is recognised by the ITU as fulfilling the IMT-2000 requirements and thus qualifies as a 3G system. Within the IMT-2000 group of technologies, DECT is referred to as IMT-2000 Frequency Time (IMT-FT)."