Multimedia communication system

A multimedia communication system comprising:

• at least one terminal of a user, capable of multimedia communication;
• and
• a control server for storing presence information of said at least one terminal of the user who uses said at least one terminal, a priority of each terminal used by said user and an occupied/unoccupied status of one or more communication media usable at each terminal;
• characterized in that said control server changes said occupied/unoccupied status of one or more of the communication media of said at least one terminal used by the user in accordance with the presence information of said user and at least one policy,
• wherein the at least one policy comprises a condition for the presence information, information for specifying the communication media, information for specifying the terminal, and action on the occupied/unoccupied status,
• wherein the information for specifying the communication media is information identifying one communication media or information representing all communication media,
• wherein the information for specifying the terminal is information identifying one terminal or information representing all terminals,
• wherein the at least one policy enables the server to select and perform any of a defined group of operations including:
• i) set the occupied/unoccupied status of all communication media at all terminals used by the user, ii) set the occupied/unoccupied status of one communication medium at all terminals used by the user, and iii) set the occupied/unoccupied status of all communication media at one terminal used by the user,
• further characterized in that said control server enables a system manager or the user to register which operation will be performed dependent upon the user presence information, and
• wherein the at least one policy comprises at least the following policies for selecting an operation:
• when the user is identified, and the presence information of the user is “LINE BUSY”, then change status of voice based communication media of all terminals to “OCCUPIED”;
• when the user is identified, and the presence information of the user is “ABSENT”, then change status of all communication media of the terminal with “ABSENT” presence information to “OCCUPIED”;
• and
• when the user and a caller are identified, and the identified caller is not a specified caller, then change status of all communication media of all terminals to “OCCUPIED”.