Were on Phone memory are vissual voice mail files stored

I KNOW for a fact that visual voice mail stores messages on the phone as files.  They can be played back LONG after being deleted from regular voice mail directly as long as left on the phone in visual voice mail, and can be played even without a sim car or internet connection...so they are stored on phone for sure. .  WHERE...what is the file path to the message files???  Other places in this forem people say they are not stored on phone... they are, as the above proves... I cannot fine where, for saving the files to my computer hard drive. CAN someone please give the path to the files on android.   THANK you much!