When did he first call in? Prior to the start of the work day?
I require my guys to page me if they are calling in sick:
1) I don't typically listen to my messages in the morning, so this way I don't get an unpleasant surprise when I get to work,
2) It forces them to face the music by actually talking to me.
Then of course, sometimes they still leave a message...But on those occasions they soon wish they'd have paged me.
