Method and communication system for processing media streams. A plurality of synchronized media streams are provided to a respective plurality of communication clients at a respective plurality of end points of a communication system. The communication clients output the media streams at the end points, wherein the amount of time required for said providing and outputting of the media streams is different for the plurality of end points. At least one of said providing and said outputting of at least one of the media streams is controlled so that the outputting of the plurality of media streams is synchronized at the plurality of end points.