This Recommendation provides the means to identify the allocation of multiple audio signals on international contribution circuits as well as the preferred ordering of these signals.
ITU-R BS.1738-2007 Referenced Document
ITU-R BR.779 Operating practices for digital television recording
ITU-R BS.1726 Signal level of digital audio accompanying television in international programme exchange
ITU-R BS.1738-2007 history
2007ITU-R BS.1738-2007 Identification and ordering of multiple audio channels carried on international contribution circuits