Group Communication in a Communication System

In a communication system providing a group communication service, a group document server is configured to detect that a scheduled conference for a group is created or modified in a group information document, and to send to an appropriate application server a group advertisement message which is extended to include a new flag, which indicates whether this group is used for a scheduled conference or not. Upon receiving the message with the scheduled conference flag, the application server is adapted to fetch a respective group document from the group document server and with it also the information about the scheduled conference of the group. The application server then schedules the conference to initiate according to the received information.