Both ITU G.723.1 and G.729 provide VAD algorithm/c code. They perform well in modest SNR environment

G729 B
......\acelp_co.c
......\basic_op.c
......\basic_op.h
......\bits.c
......\calcexc.c
......\coder.c
......\coder.mak
......\cod_ld8k.c
......\decoder.c
......\decoder.mak
......\dec_gain.c
......\dec_lag3.c
......\dec_ld8k.c
......\dec_sid.c
......\de_acelp.c
......\dspfunc.c
......\dtx.c
......\dtx.h
......\filter.c
......\gainpred.c
......\ld8k.h
......\lpc.c
......\lpcfunc.c
......\lspdec.c
......\lspgetq.c
......\octet.h
......\oper_32b.c
......\oper_32b.h
......\pitch.c
......\post_pro.c
......\pred_lt3.c
......\pre_proc.c
......\pst.c
......\pwf.c
......\p_parity.c
......\qsidgain.c
......\qsidlsf.c
......\qua_gain.c
......\qua_lsp.c
......\read1_4.me
......\sid.h
......\tab_dtx.c
......\tab_dtx.h
......\tab_ld8k.c
......\tab_ld8k.h
......\taming.c
......\typedef.h
......\util.c
......\vad.c
......\vad.h
......\zhcode_readme.txt

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