Before you can specify sound files to be used in calls, they must exist on the system. The function soundFileCreate allows you to upload a sound file to the API and have it stored along with a description. An ID will be returned and can be used in overlay requests from that point onward.
We have recorded a sound file with a message to play in certain circumstances, we call soundFileCreate with:
Note, all sound files must be uploaded in 8-bit wav format.