This annex, dubbed "Annex C+", extends the former Annex C (09/98).

Former Annex C contained G.729 main body and G.729 A and B floating point implementation. Annex C+ defines the integration of G.729 main body with Annexes B, D and E in floating point arithmetic.

This annex includes an electronic attachment containing version 2.1 of reference C code for floating point implementation of CS-ACELP at 6.4 kbit/s, 8 kbit/s and 11.8 kbit/s with DTX functionality.