This answer was collected from Askimam.org, which is operated under the supervision of Mufti Ebrahim Desai from South Africa.

Our imam has now started the practice of calling only one Azan (2nd azan) before Jumu’ah prayer but a few people are opposing it.

Answered by Askimam.org

Subject:           First Azan for Jumu’ah Prayer Assalamo Alaikum, The first Azan for Jumu’ah prayer, which is called ahead of the Azan called before the Khutba in front of the Khateeb was introduced by Uthman (3rd khalifa rashid), Radi-Allahu Anhu. It was introduced to make the people aware of the time of Jumu’ah prayer so they could make… read more »