Export 8-bit WAV

My firm just upgraded our phone system to unify it across 4 different states. The IT manager is a friend and former boss...he was thinking about using some of my music for the backgrounds when people are on 'hold'.
 
The phone system supports 8 bit mono WAV files. I can get to the mono part but how would I get to the 8 bit part? Is that even possible? I don't see it in any of the tools I have...
 
Thanks,
 

I have audacity version 1.2.6. Looked in the menu system and couldn't locate an 8 bit export option. Do you recall where it is located?

Thanks

Many phone systems in North America use an audio format known as u-law.  This nonlinear format supports a few different sample and data rates and is saved as a .wav file. (the .wav header can specify a number of different formats, u-law being one of them)

Without knowing the details of how your particular system works, give it an 8-bit 44.1 kHz file and see what happens.  It may be able to work with that format or may do an internal conversion.  If it doesn't work, you should try 8-bit at a sample rate of 8 kHz, which is one of the default formats specified for u-law.