417-875-6007 is an ATT agent number. Most likely calling about your DSL and phone service. I would assume you have ATT services as they do not do "cold calls", they only update records of active accounts that I know of

Hung up on answering machine.

We got a call from this number and the man was a gentleman.  Asked about our AT&T services and wanted to know if there was anything he could do to help our business be more profitable.  I am so sceptical about callers asking about any of our equipment because scammers are everywhere.  Even reputable companies have salespersons that will do anything for a sale and end up trying to get money out of us when we didn't ask for the products.  I called the number back after hanging up and got a recording that said; " Thank you for calling AT&T, there is no one available to take your call, please leave your name and phone number including the area code and someone will return your call."  Right.  I recorded my message machine to say that I'm superwoman and will come and save them, no need for 911.  I will watch our phone bill closely for slamming.

OK TO ANSWER, THEY NORMALY JUST DO FOLLOW UP CALLS.  I had changed my calling plan and the next day they followed up for more info.

Called our office but did not successfully navigate our IVR. Caller ID said "PROTEL SYST SUP" <4178756007>