first time they called, just wanted to know who they were

Received seven calls on my cell phone from this number today (9/11/2007).  I picked up the first two times and it sounded like a fax machine trying to connect.  On the third call, I ignored it.  Same for four-seven.  I had five voicemails of what sounded like a fax machine.  Fairly annoying as when I answer, it's wasting my minutes.  I'd like to know who this is so I can tell them to stop.

From a reverse lookup on whitepages.com:
(314) 364-2000
Type: Land Line
Provider: Southwestern Bell
Location: Sappington, MO

Rec'd a call today (9/18) answered, no response on other end have tried several times to call th enumber back and on a landline nothing happens on my cell phone "call ended" is promptly displayed.

Recived a call today at 11:40 am, I answered and there was not response, anyone know who owns this phone? Husband tried calling back and he said he got beeps and the phone hung up, said it sounded like it had a block on the phone maybe?

It's a Doctor's office in West County