Received ANOTHER call from this number about 1/2 hours ago... Again, who/what ever this is did not leave any message & hung up when voicemail picked up.

According to http://www.verifyphone.com/phone-lookup-reviews/320-299-4968 :
This reverse phone number was traced from the following IP addresses: 71.74.237.117, 98.90.240.122

According to DomanTools.com:
IP ADDRESS 71.74.237.117 is allocated to:
cpe-71-74-237-117.neo.res.rr.com
Comment:        Allocations for this OrgID serve Road Runner residential customers out of the Columbus, OH, Herndon, VA and Raleigh, NC RDCs.
>> BUT IF YOU DO A tracert it goes to IP ADDRESS: 24.164.113.10 (msgig17-0.lornoh1-ar42.neo.rr.com)    
IP Information for 24.164.113.10
IP Location:     United States     Cleveland     Road Runner Holdco Llc
ASN:     AS10796
Resolve Host:    gig17-0.lornoh1-ar42.neo.rr.com
------- AND ---------
IP ADDRESS 98.90.240.122 is allocated to:
IP Location:     United States     Mobile     Mob Adsl Cbb
ASN:     AS6389
Resolve Host:    adsl-98-90-240-122.mob.bellsouth.net
CustName:       MOB ADSL CBB
Address:        575 Morosgo Dr. NE
City:           Atlanta
StateProv:      GA
PostalCode:     30324
Country:        US
RegDate:        2010-03-03
Updated:        2011-03-19
Ref:            http://whois.arin.net/rest/customer/C02435647
>> BUT IF YOU DO A tracert it goes to IP ADDRESS: 72.157.48.37 (Atlanta     Ears Interconnects - Mob)