Why would he need to call the cops while at the house if the cops were with him?
http://qqq.tmz.com/2007/02/20/howard-k-the-heat-is-on/
He just had a security (baby-sitting) detail with him, but wanted to alert detectives? I don't know. Maybe he just "called out" to the LE who were in a different room or outside. I wasn't there.