Extern function of encoder and decoder G726

Hi all,

I downloaded from the page of the TI G726 Encoder and Decoder c55xx, but there are questions.

http://software-dl.ti.com/dsps/dsps_public_sw/codecs/C55X_Speech/index_FDS.html
 G726 Encoder and Decoder, Version 2.00.00.012

・g726DecoderMain.c ([install folder]\G726_3X_REL200_ROOTDIR\g726\tstsrc\c55x)

line 39 to 41
       extern void G726_TII_g726itbl40(void);
       extern void G726_TII_adpcmalaw(void);
       extern void G726_TII_adpcmmulaw(void);

The entity of the above functions, Is there g726dec_tii.l55l([install folder]
\G726_3X_REL200_ROOTDIR\G726_3X_REL200_ROOTDIR\g726\c55x\make) ?
I think the function is provided by the library.

Regards.