Dubai is 3 hours ahead of Berlin (winter) or 2 hours ahead (summer). When it's 12:00 PM in Berlin, it's 3:00 PM in Dubai. UAE does not observe DST.
Berlin uses CET/CEST while Dubai uses GST (Gulf Standard Time).
Optimal window: 9:00 AM - 3:00 PM Berlin time (12:00 PM - 6:00 PM Dubai). Morning and early afternoon calls from Berlin reach Dubai business hours.
Dubai hosts many German businesses and is a major hub for trade between Europe and Asia.