Received a call from this number, but was on the phone at the time so didn't answer.  Then 8 minutes later when I was still on the phone get a call from the same area code and prefix but 720-606-7123 came in.  Probably from the same outfit.  Both calls activated the voice mail but just left 52 secs of beeps both times.  I'm in Texas.

calls and doesn't leave message-obvious robo caller spam/scammer

Got a call from them this morning at 4:30 AM.
Caller ID displayed NETPROWA.
Voice mail message was just beeps for at least 30 secs.
It is possible that this may have been from a FAX machine.

Caller ID displayed "Fort Lupton, CO" so I knew it was a call I didn't want, but answered anyway.  I planned to just mess with them but it was just beeps.

Received a call from 720-606-7053 at 12:39 EST.  We are wise to these calls  with caller ID.  Anyone, and I mean anyone that we do not know,  we do not answer the call.  We then report it on the do not call org list.  So very sick of these calls every day.    We are very close  to having our landline disconnected from Verizon.