Someone calls, asks my name and hangs up

I received call 3/4/08 around 9:15A.  Someone asked for me by name and hung up.  I called the number back 208-344-2000, recording says Always Systems. Options were given 2371 Service, 2373 Customer Services, 2379 Sales and others. I dialed 2373 Customer Services, got Tammy's voice mail.  I left my number but not my name to call back. I also did a reverse number search on the internet and the number belongs to a sanitation company.