This paper discusses a communication model to exchange multimedia messages in a group of multiple processes. Quality of Service (QoS) required by an application has to be supported. In traditional communication protocols like TCP, a process can reliably deliver messages to one or more than one process. In the group communication, a process sends messages to multiple processes while receiving messages from multiple processes in a group. We propose a notification-based data transmission procedure to exchange multimedia messages with processes so as to satisfy the QoS requirement.