2 calls in 2 days, no message left.

?

Called today.  Left message "call me."

According to another look up, it is a Level 3  VoIP  number with a Fresno area code.
Since it is VoIP, the caller could probably located any where in the world
I didn't pick-up and they didn't leave a message

Caller ID only said "Fresno, CA." They hung up when the answering machine went on.