Abstract
The development of Internet technologies is characterized by wide possibilities for introducing various telecommunication services, in particular IP telephony, which provides users with a new technology for multimedia traffic transmittion using Internet networks. Special data transfer protocols (SIP and H.323) are being actively developed to apply this technology, which enables the organization of private and corporate data networks. The paper analyzes the use of these protocols based on the Panasonic KX-NS500 IP station, which has made it possible to give recommendations on improving the operation of internal telephone network for the transmission of voice traffic for various types of codecs. The article discusses the problem of improving the efficiency of IP based voice communications using SIP and H.323 protocols. A communication model, that uses three analog phones and three IP phones serviced by an IP station, is proposed. The telephone line uses SIP protocol. The OPNET Modeler software environment is used to investigate the performance of the proposed network model. The optimal type of voice codec for SIP protocol and the possibilities of using the protocol in the organization of internal telephone network using the IP station are determined. The telecommunication network segment using SIP protocol has been simulated and the characteristics of two communication codecs most commonly used in VoIP technology have been analyzed. Based on the simulation, the assessment of the quality of the speech signal by the MOS rating, the range of delay of the speech signal and the choice of a codec to play a voice signal for the proposed network model have been made.
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