DECT development The standard for DECT or Digital Enhanced Telecommunications system was developed by members of the European Telecommunications Standards Institute (ETSI). The first release of the standard was available in 1992 (which later formed part of a suite of protocols like DECT / GSM, DECT/ISDN, etc).
DECT air interface operation The DECT spectrum is available for license free operation worldwide in over 100 countries The most common protected spectrum allocation for DECT is 1880 MHz to 1900 MHz (European). There is also protect spectrum in 1900 MHz to 1920 MHz and in 1910 MHz to 1930 MHz (several countries in America / Latin America) range. In addition to these frequencies there is also a reservation in some countries in the band 2010 MHz to 2025 MHz.
DECT carriers have been defined for the whole spectrum range 1880 MHz to 1980 MHz and 2010 MHz to 2025 MHz in the ETSI standard. The basic frequency plan for the 1880 to 1900 MHz DECT band provides for ten channels. (The USA uses five channels in the 1910-1930Mhz range)
It is mandatory for handsets (or beltpacks) not to start transmission on carrier frequencies other than those informed by the base station in broadcast messages.
Clear-Com have further enhanced the standard DECT standard to include amongst other features the use of the G.722 codec which allows for 7Khz audio bandwidth (which is twice that of normal DECT telephony systems)
Follow the link for worldwide DECT frequency allocation: https://www.dect.org/dect-technology  *It’s the responsibility of the user to seek approval for countries no allocation specified