It was developed by COST 211 and published by the CCITT (now the ITU-T) in 1984, with a revision in 1988 that included contributions proposed by other organizations.
Был разработан COST 211 и опубликован CCITT (сейчас ITU-T) в 1984, обновлен в 1988, включив дополнения сторонних организаций.