If the athaan is heard in any other month besides the months of Hajj it means he will impart the knowledge of Deen through discourses and lectures. The same applies to athaan heard in streets and lanes.
It symbolises a person’s Deen. Thus, if a person sees his hearing ability increased it suggests that he will progress in matters of Deen. But if he sees it as defective, it suggest similar defects in his Deen.