Download and install SoX (attached to this blog below).
For example you already have the folder 'Audio' with audioprompts on you desktop.
Go to 'C:\Program Files (x86)\sox-14-4-2' and create the link to sox.exe
![timuryuldashev_1-1669721378141.png timuryuldashev_1-1669721378141.png](https://community.cisco.com/t5/image/serverpage/image-id/169312i8B6E9F82B00497F4/image-dimensions/578x593?v=v2)
Rename it to 'sox'
![timuryuldashev_2-1669722491613.png timuryuldashev_2-1669722491613.png](https://community.cisco.com/t5/image/serverpage/image-id/169313i7EE16BA78AF71EB2/image-size/medium?v=v2&px=400)
Then create a folder 'Converted'.
![timuryuldashev_3-1669722530290.png timuryuldashev_3-1669722530290.png](https://community.cisco.com/t5/image/serverpage/image-id/169314i9FE6CD2E0A385939/image-size/medium?v=v2&px=400)
After that create file 'sox.bat' (Create text file 'sox.txt and rename it)
![timuryuldashev_4-1669722614505.png timuryuldashev_4-1669722614505.png](https://community.cisco.com/t5/image/serverpage/image-id/169315iBBE577FD24B56BE9/image-size/medium?v=v2&px=400)
Edit it, paste the following script. (Use your own path)
for %%f in (*) do (
echo Convert %%f
sox.lnk "C:\Users\Tim\Desktop\Audio\%%f" -e mu-law -c 1 -r 8000 "C:\Users\Tim\Desktop\Audio\Converted\%%f"
)
pause
Save and execute it. In 'Converted' folder you will find all converted audiopromts.