I have information regarding the creation of a contract, as shown in episode eight of Black Butler II or whatever arc Alois Trancy is introduced and featured; the circumstances regarding Claude's summoning were these:

Alois Trancy heard another boy in front of him trying to inform another about the pack between humans and demons; the boy was not interested however Trancy was. Trancy can then be seen wandering around a forest filled with cob webs, after putting a cobweb onto his face he says (crucial): "O heio tarola rondero torel" or something like that.