Caleb (and his sister) will occasionally come by around midnight and knock on the door. Neither will call you.
They have called before. Usually one or both will visit my sim. Sometimes Vladislaus will visit too. I have had Caleb, and once on a blue moon Lillith, call my what ever sim I may be playing at the time during the night asking if they would come over to their house because they have a important question to ask. So yes, Caleb or Lillith will call.
Only one time did I have a random vampire sim call and ask a sim if they could come over to my sim's house because they have a very important question to ask.
