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This example is a JAIN SLEE application which processes SIP messages from registered SIP UAs to act as an Wake Up system.
It is a simple example but provides usage of JAIN SLEE child relations, timers, null activities, sbb activity context interfaces and JAIN SIP RA code, thus being very useful for beginners.
The sender uses a specific MESSAGE format, containing a timeout T and wake up message M values, and then, when T seconds pass, the service will send a message containing M back to the UA.