This annex provides the DTX functionality for the 6.4 kbit/s CS-ACELP algorithm of G.729 Annex D using the basic algorithm in G.729 Annex B.

This annex includes an electronic attachment containing version 1.1 of reference C code and test vectors for fixed-point implementation of CS-ACELP at 6.4 kbit/s and 8 kbit/s with DTX functionality.