Incorrect file format?

Question

My company uses a "high definition" phone system, and after recording announcements from a phone handset, my home quarantine inspired me to record everything in my home studio.
 
Everything sounds great, but when I try to upload the files into the phone system, the upload fails. They allow 16-bit, 16kHz PCM WAV files, and that's how I configure my export, but it says the files are corrupt or using the wrong codec. I've been over this probably 50 times and it always fails.
 
I called the phone company and explained my problem. They suggested I run the files through a file converter at g711.org. I did that, using the "High Definition WAV (16Khz, Mono, 16-Bit PCM)" option, and the resulting files work fine.
 
So, how do I get my top-of-the line audio production program to export files in the same format as this little one-page .org site? I tried the libsndfile format as Steve suggested. One third of my files exported as .WAV, one third of them exported as .AU, and the final third exported as .aifc. So... I have no idea what I'm doing wrong. Any ideas?
 
[Mod note: moved to a thread of its own]

SteveG_AudioMasters_ · Answer

I don't think that libsndfile is the way to go for what should be an absolutely normal integer file format. Just to find out if there was anything at all weird coming back from the g711.org site I tried it with a file from here, and what came back appeared to be a completely normal 16k 16bit mono wav file - it opened in Audition with no difficulty at all, and with nothing untoward in the metadata either. So my question is - if you save it with exactly these parameters:

Does it work?

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