From another site I quote: "This raised platform is found in the big scale mosques and is positioned mostly in the middle right side of the nave, opposite to the imam’s minber. The müezzin stands on mahfil to give responses during the imam’s sermon, the khutbah. The müezzin is the person who leads the call to prayer at Friday services. The muezzin is also the person who calls for prayer five times a day. While he used to climb up one of the minarets in the past, these days he has a PA system to his disposal." In the Selimiye this platform is so impressive (and now well-restored) that I took very many pictures, it deserved a sub-gallery of its own.