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In the preceding diagram, the depiction of a message sequence as a single transmission is a diagrammatic convenience only. The actual sequence of commands corresponding to any given message sequence is the specified Message, Data, [Data], …EndMessage commands. A sequence for one session can be interleaved with messages for another session.
The originator adds a message sequence to the OutboundMessageList upon sending the EndMessage command (as specified in section 3.1.4.6). The recipient adds the message sequence to the InboundMessageList on receipt of the EndMessage command.
The following sample sequence diagram illustrates this by explicitly showing the individual commands involved in transmission of message sequences from Device 1 to Device 2, with annotations indicating the appropriate acknowledgment list maintenance actions to be undertaken by the two devices:
Figure 24: Interleaved message sequences