Who called from 2812062117

Called twice this morning on my work Blackberry.  Nobody there - sounds like they are trying to fax.  I haven't given my Blackberry number out to anyone; I only use it for email.

I keep getting this same fax from 2812062117....did you find out what or who it is?

Yeah me too, this number has called me three times today.

6 X's today ( done calls 10 min apart )!
First call started this morning.  It is now close to 2:00 p.m.

I pick up & hear nothing!
I call back it sounds like someone is is punching the number keys Yeung to call someone & them I hear fax like sounds.

Just called again & it making beep sounds!