Didn't answer as I didn't recognize the number.  Was 'supposedly' from Cedar Hill, Tx

Same as other posts. Blocked 'em!

Collect call. Lots of beeps. Not sure if it was a fax machine or not, as others have reported.

This is SPAM Junk FAX and is almost impossible to read.
Pretty sure it is MyCrystalTraining.com
You can email the creeps at support@impeka.com abuse@rebel.ca

This was a spam junk FAX sound left on my answering machine. I always keep my FAX machines turned off because of jerks like this. And, blocked them. But, they will probably call from another of their extensions. Just keep blocking them.