This is Survey Sampling International - they maybe legit but I too got the silence when answering and on voice mail.
Finally last night a fella (foreign speaking) told me the name.  I also called the number and they claim to have a web page.I told them I was on the do not call list for future calls.

KILL EM ALL!

Well I've heard of this SSI but I DON'T want any BS calls. This was on 12/16/14 @ 4 PM CT on a Landline. Gotta get that *60 out again. GRR.

Suddenly in the last couple days, I have had several calls at various times from SSI @ 630-423-5613. I live in 630 but the number isn't familiar so I don't answer. I am forever thankful that I have a caller ID for each phone and I rarely even turn my cell phone on. And now there is an election coming up. So much for the Do Not Call Registry....I guess if they put any kind of identification on their outgoing call it gets past the registry. But we know they can make it say almost anything. Once I even got a call where the caller ID showed MY NAME and MY PHONE NUMBER. Impossible and frustrating!

Survey's do not fall under the DNC unless they are trying to sell you goods or services.  They are exempt as a ROT, along with political calls and Charity.

This is SSI  Survey Sampling, a marketing research company. To get removed from their call list:  URL is http://www.surveysampling.com/.

Keep in mind that if they do not place you on their internal DNC list, they can still get into trouble. As a rule, survey's are exempt from the DNC though. Do consider maybe getting a call blocking device or phone.. You can google them and many are around $50.00 or under.