audio content architecture (ODA) (ACA)

The Audio Content Architecture (ACA) provides a copy protection function by incorporating various audio file formats into ODA documents.

The interchange format for the Open Document Architecture (ODA), the Audio Content Architecture, is described in ITU Recommendation T.419 of 1995.

Part 9of the ODA specifications describes how a voice message or other audio content can be attached to an ODA document. The audio files can be decoded using the G.711, G. 722, G. 726 and J41/2 audio codecs.