Repeated calls from this number but they do not leave a message. When I try to call back there is a recording saying "this is not a working number." This  leads me to believe it is a debt collector or sales call with outgoing calls only.

Caller didn't wait for more than 3 rings.  A call back says it is outbound only.  They were calling my business number which was moved to a cell phone.  The caller appears to be a multidrop operating from 765-201-2300 base (of which 765-201-2304 is one) apparently in Delphi, In.  My guess is that is it the "INFOP" which is a police benefit "scammer" according to BBB.  Just another telemarketer attempting to skin you out of your dollars.

I got a call from them today as well, but didn't answer and they didn't leave a message.

I have been receiving calls to my business # this month. 3 so far & it is only the 12th.  I also received the "non-working number" recording.  Know anything about who is doing this or how to find out? Thanks.

I have gotten a call from this number every workday last week and at different times during the day.  none on the weekend and then again today.  no one speaks, no messages left on voicemail nothing.   I get the same recording that it is a non working number.  But on a reverse look up it says that it is in delphi indiana.  Living in Indiana myself...delphi is little little little.  I don't know there is much business in delphi