Issue No. 03 - May/June (2002 vol. 6)
<p>The Cinema system uses a SIP-based architecture to integrate Internet telephony services with an existing PBX infrastructure.</p>
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.