It had been a while since i had to make a new MOH file and i thought i knew the format the WAV file needed to be in.
The manual and google both say 8bit 8khz mono.
I could not get the file to upload successfully
What i was missing was a-law (Europe) and CCITT.
If you try with PCM it fails.
Also while googling i found somebody saying that the windows sounder recorder would not work for uploading RAD messages.
I now use a program called Switch