This number calls several times a day, and sometimes within 5 minutes of the previous call. When I pick up the call, no one speaks. There is no fax tone, and no voice. Why call if you aren't going to say anything? Either this is a retarded burglar (calling several times each day and calls that are often 5 minutes apart) who stays on the line until I hang up, or someone's dialing computer isn't set properly (doesn't start with an automated sales pitch or start a fax transmission). Either way the originator of these calls isn't very bright.