i also got this call ... did not answer .... been told by law enforcement that these type of calls allows the caller to capture a good number and clone your phone. some technologies even allow them to hack your personal information (facebook, online banking accounts etc)..... other area codes to watch out for are 277 and 278. these numbers usually look like this : 278 467-24568 ..... note the five digits after the prefix.
I have received 4 calls from this number in less than 24 hours. They never leave a message. I have no idea who they or what could be so important they call every few hours.
Just got a robo call from 423 468 5425
"Hi this is Ben with the Home Security Group".
I believe this same caller has called from 978 570 2447
I filed weeks ago on the do-not-call list, and have submitted to FCC, but clearly these guys don't care.