Who called from 6174560841

When I called back it sounded like a fax

they called me today, didn't leave a message

My wife answered the phone and when she told the person I was not home, could she take a message, the person hung up on her.  She tried calling the number back, but it was whistling like a fax line.  No idea what company.

Same here, except that I didn't try calling back.

They called today, but all I heard was my own voice fed back to me after a small delay.  They hung up after about 30 seconds.