An application server for controlling communication of packet data with a plurality of communication devices in a multicasting session is disclosed. The application server is configured for receiving information regarding a packetization parameter that is desired by at least one of the communication devices for reception of packet data, for assigning a different value for the packetization parameter for use in a multicasting session, and for controlling communication of packet data to the plurality of communication devices in the multicasting session based on the different packetization parameter.