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[1] J. Davidson and J. Peters, Voice over IP Fundamentals, Cisco Press, 2000. [2] J. Rosenberg, H. Schulzrinne, G. Camarillo, A. Johnston, J. Peterson, R. Sparks, M. Handley and E. Schooler, “SIP: Session Initiation Protocol,” IETF RFC 3261, Jun. 2002. [3] The SEFT website. [Online]. Available: http://www.enum.org.tw/ [4] P. Srisursh and M. Holdrege, “IP Network Address Translator(NAT) Terminology and Considerations,” IETF RFC 2663, Aug. 1999. [5] M. Handley, V. Jacobson, “SDP: Session Description Protocol,” IETF RFC 2327, Apr. 1998. [6] J. Rosenberg, J. Weinberger, C. Huitema and R. Mahy, “STUN – Simple Traversal of User Datagram Protocol(UDP) Through Network Address Translators(NATs),” IETF RFC 3489, Mar. 2003. [7] The Internet FAQ Archives website. [Online]. Available: http://www.faqs.org/rfcs/rfc3489.html [8] VOCAL Prepaid B2BUA, Vovida Open Communication Application Library [9] A. B. Johnston, SIP Understanding the Session Initiation Protocol, Second Edition, Artech House, Jan. 2001. [10] The VOVIDA website. [Online]. Available: http://www.vovida.org/
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