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ABSTRACT
<p>The Cinema system uses a SIP-based architecture to integrate Internet telephony services with an existing PBX infrastructure.</p>
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CITATION

W. Jiang, J. Lennox, S. Narayanan, H. Schulzrinne, K. Singh and X. Wu, "Integrating Internet Telephony Services," in IEEE Internet Computing, vol. 6, no. , pp. 64-72, 2002.
doi:10.1109/MIC.2002.1003133
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