This number has called several times in the last month or so. I have answered the phone 2 of those times, the first time no one was there, today I could hear people talking and some sort of techno music playing in the background, but no one said anything.
I no longer answer unidentified/unknown phone calls, since 9 out of 10 calls I get are spam. If it's important, they'll leave a message. This one, as usual, left no message and produced no company info when googled -> BLOCKED