question #3 Sahih Muslim 1092c, Book 13, Hadith 44 : What can be inferred about the coordination between the Mu’adhdhins during the time of the Prophet (ﷺ)?

Bilal announces Adhan at (the fag end of the) night (i. e. Sahri), so eat and drink till the son of Umm Maktum announces Adhan. And he (the narrator) said: And the (difference of time) between their (Adhans) was not more than this that one climbed down (from the minaret) and the other climbed up (to announce Adhan).