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In many distributed environments, when one session is initiated by the originator, multiple nodes may have been involved during its negotiation and setup. In particular, in order to provide some value-added services, multiple protocols may also participate through inter-working for the same session. This scenario makes some desired functions extremely difficult, such as management, tracking, accounting, and troubleshooting. There is a strong need for the solution of singling out the activities of the same session and identifying the information belonging to the same session.