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A new SIP proxy prototype supporting H.323 protocol in OPNET Modeler

Signaling is one of the keys to voice over IP success; it provides all basic elements to establish successful IP calls with a high-quality service depending on network capacities. To display these competences, OPNET Modeler is an available simulator which evaluates every network environment and tells which scenario is the most suitable. In this developed tool, it is possible to implement voice over IP (Voip) networks with a great management of signaling parameters. However, in OPNET Modeler, there is no model node which offers the possibility to operate networks that support two different signaling protocols (session initiation protocol “SIP” and H.323) in the same time. In this paper a deep study of signaling protocols is conducted together with modifications made to create a new device encompassing proxy to support SIP and gatekeeper to establish H.323 calls in the same scenario.