this number is from someone calling using a VOIP (voice over internet protocol) which uses a computer to call ur mobile/house phone...might be someone using skype or any other softphone program.
answer it if u know someone who might be calling u using a computer. BUT IF NOT, DO NOT BOTHER ANSWERING THE PHONE, IT IS MOST LIKELY TO BE ONE OF THOSE PESKY TELEMARKETERS, especially calling from out of the United States. in your case, its a telemarketer.
most pc-to-phone calling program create a "virtual" phone number and this number, 3104219102 is one of them. DONT BOTHER CALLING IT BACK. hope this helps...
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