METHOD OF INDICATING STATE OF CALL PROGRESS, CONFERENCE CALL CONTROL DEVICE AND CONFERENCE CALL SYSTEM

摘要

FIELD: information technology.SUBSTANCE: once a call request is sent to a called terminal, information on multimedia indication of the state of the progress of the call is obtained. The information on multimedia indication of the state of the progress of the call is sent to an administrative control station of a conference call control device and/or to a conference call terminal so that the administrative control station of the conference call control device and/or the conference call terminal output the corresponding multimedia indication of the state of the progress of the call according to the output information on multimedia indication of the state of the progress of the call.EFFECT: efficient transmission of information on multimedia indication of the state of the progress of a call and saving memory resources of an administrative control station of a conference call control device and a conference call terminal since they are not used for storing information resources for indication.8 cl, 9 dwg