608-371-6666

Well, considering how that information is 6 years old, you have no place to dispute it.  That person, who is a respected member here was simply relaying their experience with the call in 2013.  Also taking into consideration that phone numbers can easily be spoofed, and that spoofers are well known to use numbers belonging to real companies, you cannot say with any type of certainty who is calling, especially since you do not answer the calls.

This is actually the number for the robo call blocking service. My initial posting was wrong due to it being the first time I had ever received a call with this number showing and it was indeed from the company that handled wife's sleep apnea.

What actually happens is if a call meets the heuristics used by the robo call blocking service for blocking, it offers an option for a live caller to press a number to ring through and not be blocked.  That is what happened with that initial call. I have since received multiple calls from a variety of valid callers that are initially screened as a robo caller but push the number to ring through.  So far all have been valid calls and they display this number.

There is a way this number will show on true robocalls that should be blocked and that is if the calling robot quickly recalls before the first call attempt has cleared, it will cause a ring through. I have also had a few instances of this behaviour.

This is the number your call will come thru with if it gets past nomorobo. If it’s a person calling, somehow they can get a code to enter to allow their call thru. I still don’t answer it and no one whose called a couple seconds after a blocked cal, has ever left a message

Christine Cook calling for Signify Health on behalf of my health insurance company to have an in-home health assessment please call me at 855-746-8710.

Come on!  I don't have  any connection, previous business with  "SleepMed Therapy" yet they call  my number. Perhaps someone is using their number? It shows as UNAVAILABLE

Look a few posts above yours for my corrected answer instead of relying on one from almost 6 years ago

I received a call, rang once, then almost immediately, rang back with NOMOROBO and 608-371-6666, which I then answered as it has been very helpful for me.  Since it was NOMOROBO though, I answered it, having forgotten just how NOMOROBO works, live person gets through...
One got through.
I am assuming that messages can and will be left when they get through NOMOROBO, if I don't answer.  I searched for an answer in the help section, but was unsuccessful in find and answer, so from now on, I will just let all  NOMOROBO calls go to the answering machine.

Received a call from this number today.  I have Nomorobo and have had very few unwanted calls come through since the new law got signed into effect regarding call providers must verify the numbers.  This one somehow got through.  I was not home, so did not answer, but no message was left.  I have no idea who it was from as only the telephone number showed on the Caller ID.

This is the phone number that NOMOROBO uses to put calls through to your phone.  NOMOROBO plays a message to the caller and if they are human and enter a captcha then the call is forwarded to your phone.  This is so they don't block real calls by accident. This is also why everybody here is saying different callers.  Those various callers could be scams but the number is not. Go back and read your info with NOMOROBO.

Received a call on answering machine 1/8/2020 from 608-371-6666. Natasha the caller identifying herself from Cirro energy, knew my name, said there was a cancellation of my energy supplier Cirro energy (which I did cancel over 6 months ago). She wanted me to call back at 844-792-4042. I googled that number and found a number of complaints from people who said they were duped into switching suppliers. I did not call back!

called twice at 6AM this morning

I use NOMOROBO too.  If the call is suspect it will catch it play a message asking them to input the number.  If a person is at the other end and they input the number the call will be sent through.

ID duplicates the phone number, and I've seen this number so many times I can recognize every time they call..  They left a message purporting to be from a guy named Thomas at Frymire Home Services, and asking that I call him back at a totally different number.  I know Frymire, and they aren't in area code 608.  I'm also not interested in talking to them, as I need nothing they are trying to sell me.  All the same, I'm getting tired of these calls.  I did call them after the first call and told them I'm not interested.  So I suspect they have sold their customer list to some outfit that makes calls from some call center trying to get people to buy things, or maybe just to collect more info.  I just want them to quit calling.

This is the number of the anti robocalling service you have subscribed to.  It has an option for a live caller that has been classified by the anti robocalling system as a robocaller that allows them to ring through to your phone. When that happens, it displays this number. There may be programming issues the prevent the anti robocalling service from displaying the actual name and number of such a caller but I would bet that if you check your call log, the number just before this one, which rang only once,  would be who the actual caller was.

Unavailable number blocked by no more robo, phone rings again, message left saying I had completed a survey for Dr. Mike, left 855-805-0005, ext. 661722 to return call.  I do not know a Dr. Mike.

Has called seveal times recently and is being blocked after first ring by NOMOROBO

No doubt they are spoofing a legitimate phone number. I've had the same "air survey" from that number.

Caller called on a different number first and when Robocalls did not let it through, he called on this number with the name NOMOROBO on my caller ID. He said his name that ended with Goldberg but he had a slight Caribbean accent. Said I won 4.5 million dollars and a Mercedes Benz.

received a voicemail from a live person about one of my properties (mentioning the numerical address) spoofing this CID asking to call back 860-455-4232. In the past, at least 3 home buying scams were able to bypass & use this CID

Called claiming to be The New Yorker Magazine with a special renewal offer. Blew them off but they said they would call later. I’m sure they wanted my credit card info to “ renew “ my subscription. I wish I had a manic want to make these people go away!