Caller ID says, "Burbank, CA."  I do not know anyone in Burbank, CA.  Did not answer a call from this number.  They did not leave a message.  I do not answer calls from numbers I do not recognize and if the call is not important enough to leave a message, it's not important enough to return.  If it happens once, I assume it was a misdial.  If it happens more than once, I assume it's a scam or spam call and it is blocked.