Called a couple times in the past couple of weeks. Left no message. I don't believe that 555 is a valid extension anywhere, which is why it's used for fake numbers on TV or movies.
Yes, definitely a spoofed number. Caller ID said "Dir Assist TN", which shows these spoofers have a sense of originality and creativity (555-1212 is a directory assistance number). They are creative but still annoying, since I have to let the phone ring 4 times before it gets dropped off....