Who called from 3233726300

I have been getting a call from this number once in while. When I called back I got busy signal.

Received another call from this number on 10/19/07 @ 9:36 AM Eastern Time.  Answered the phone with our firm name, repeated it, listened quietly for abou 4 seconds, then there was "click" on the other end as the connection was terminated.  Did a reverse look-up to identify the caller.  A return phone call to this number prompted a fax tone.

Call with no one on the phone on 10/29/07 4:32 PM

323-372-6300 DRG on Caller ID - Called and left no message on voice mail ~12:10pm Eastern Standard Time (New Jersey).
I do not answer phone calls, unless I know the Caller ID, and I try to immediately "Google" the phone number to check and report it to a few websites such as this.  
Can't any organization stop these types of phone calls, or aren't there any laws regarding this?

Hang up call (12Dec07 at 1542 PST) after I flashed over from another conversation.  Very annoying, and we are on the no-call list, too