These encoders convert 16 bit, linear PCM, 16 kHz, mono WAV files into raw G722 and G722.1 files that can be used with FreeSWITCH to play audios and avoid transcoding. For this to happen you will need to enable the mod_native_file module in FreeSWITCH and use the G722 and G7221 file extensions.

You need to install the following three libraries to be able to compile the encoders:

sudo apt-get install libsndfile-dev libtiff-dev

From within the FreeSWITCH directory run the following commands:

./bootstrap.sh
cd libs/spandsp
./configure
make
sudo make install
sudo ldconfig

After running the previous commands and going back to the FreeSWITCH directory run:

cd libs/libg722_1
./configure
make
sudo make install
sudo ldconfig

In order to compile the encoders run:

make
sudo make install

The encoders have the following syntax:

g722enc <WAV file> <G722 file>

and:

g7221enc <WAV file> <G7221 file>