So far I have received 2 calls from this number today @ 10:12a & 11:11a (CST)... No message left either time...
Most likely it's the SCAMMER/SPAMMER BOGUS TELEMARKETERS calling trying to "sell" their junk.
The exchange 720-496 is managed by LEVEL 3 COMMUNICATIONS, LLC. The number is currently on switch number DNVTCO56DS2.