Title: H.323 compliant voice over IP system

Authors: C.K. Yeo, S.C. Hui, I.Y. Soon, L.M. Ang

Addresses: School of Computer Engineering, Nanyang Technological University, Nanyang Avenue S 639798, Republic of Singapore. School of Computer Engineering, Nanyang Technological University, Nanyang Avenue S 639798, Republic of Singapore. School of Computer Engineering, Nanyang Technological University, Nanyang Avenue S 639798, Republic of Singapore. School of Computer Engineering, Nanyang Technological University, Nanyang Avenue S 639798, Republic of Singapore.

Abstract: This paper describes the design of an ITU-H.323 compliant architecture for supporting voice over IP in a heterogeneous environment. The system provides IP telephony services to support the two main groups of telecommunication users, namely, the conventional PSTN phone users as well as the Personal Computer (PC) users. This means that the caller-to-callee can be any of the four scenarios: PC-to-PC, PC-to-Phone, Phone-to-PC, and Phone-to-Phone. The compliance to the H.323 standard ensures its interoperability with other IP telephony equipment. A Direct call signalling with Different Gatekeepers (DDG) model has been adopted. The proposed architecture comprises five main components; the Gatekeeper, the Gateway, the Exchange server, the Web Server and the Client.

Keywords: voice over IP; internet telephony; ITU-H.323.

DOI: 10.1504/IJCAT.2003.000321

International Journal of Computer Applications in Technology, 2003 Vol.16 No.4, pp.143-153

Published online: 16 Jul 2003 *

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