a message analysis device serves for the analysis of messages transmitted via service access points on layers of an osi reference model . the message analysis device comprises a storage device , for storing messages , a selection device , for reading a series of sequential messages and a display device , for the display of at least one first region and one second region . in the first region , a series of messages read by the selection device from the memory device can be displayed as a list . the selection device determines a characteristic feature of messages for at least one service access point , transmitted by the service access point , whereby the curve for the characteristic feature may be displayed on the display device in the second region .