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Abstract: A Java-based approach for implementing SIP (Session Initiation Protocol) stack is presented in the paper. A layered SW architecture, 2-stage concurrency and synchronization mechanisms are introduced. SIP's application in PINT is also discussed.

Key words: commnication protocols, session initiation protocol (SIP), IP telephony, PINT, [1] HANDLEY M.SIP:session initiation protocol[Z].IETF-RFC 2543,1999.
[2] SCOTT Petrack.The PINT service protocol:extensions to SIP and SDP for IP access to telephone call services[Z].
IETF Internet-Draft,1999.
[3] ITU-T Q.725, Signaling performance in the telephone application[S].
[4] Alan Johnston.SIP telephony call flow examples[Z].IETF Internet-Draft,2000.