never leaves a message. when called, message says outgoing line only.

The never leave a message. When called, message says outgoing line only.  They do not answer if you answer, the line goes dead.  I received a 'rap rhyme' with profanity from this number in 2006, which I reported to local police.  We have gotten sporadic calls since then, the most recent being Feb 16, 2008.

Update:

This is a telemarketing firm. Here is the info:

SHOA
2840 Linda Ln
Oklahoma City, OK , 73115-5012  
Phone: 405-672-7400
FAX: 405-671-8550

I just got a call from this number and as soon as I answered they hung up.  I called right back and got a message that this number is set up for outgoing calls only.

Same experience as Ryan H no one there when I answered and there was no way to call back.