The functionality of CCITT includes

• a function for encoding texts in decimal or binary numbers or decoding them according to the CCITT standards
• a function for encoding texts in punched tape or decoding punched tape according to CCITT standards
• the display of different symbol tables of the CCITT standards
  

Existing codes

• Baudot code, US patent 1888
• Baudot code, 1926
• Murray code, 1926
• Siemens code, 1926
• Western Union code, 1926
• CCITT ITA-1, 1926
• CCITT ITA-1, 1929
• CCITT ITA-1, Europe/Continent
• CCITT ITA-1, UK
• CCITT ITA-2, 1929
• CCITT ITA-2, 1931
• CCITT ITA-2 MTK-2
• CCITT ITA-2 US TTY
• CCITT ITA-3
• CCITT ITA-4
• CCITT IA-5, IRA
• CCIR 476