The development of communication networks currently follows such a trend, that is, from the traditional single service network for voice transmission to the new generation of integrated service network for data, voice and video. The traditional voice communication network is built on the basis of the telephone network. Although it has undergone years of digital improvement, the DDN (Digital Data Network) technology for data transmission, the B-ISDN technology for integrated services and high-speed digital access technology have emerged, but the structural characteristics of the entire network have not changed. Its switching mode is still mainly circuit switching, and its complex signaling system makes the network control highly centralized and lacks flexibility. These characteristics are unfavorable factors for the realization of integrated services including data and multimedia information. In order to solve this problem, the industry has proposed the concept of the next generation network (NGN). Its core idea is service-driven, that is, the separation of media and transmission, and the separation of transmission and control. It does not require the combination of television network, telecommunication network and computer network at the physical level, but realizes the integration of the three networks at the high-level service level, providing a unified and open platform for the transmission of various services such as voice, data and video on the three networks. In this case, the traditional highly centralized network control concept is not feasible. The new network architecture requires further simplification of the network control function to achieve platform unification, which requires the intelligentization of terminals, that is, the use of a new generation of intelligent terminals to replace traditional dumb terminals including voice phones and televisions. Intelligent terminals have powerful computing and processing capabilities and can complete various communication protocols at the application level. Compared with traditional dumb terminals, the design of the software and hardware structure of intelligent communication terminals is much more complicated, but the flexibility of communication and the scalability of protocols are much stronger. This paper presents an implementation scheme of a multimedia intelligent communication terminal, which uses an embedded Linux operating system, is based on IEEE 802.11b wireless LAN access technology, follows TCP/IP protocol, supports IP v6 and mobile IP v6, and supports multimedia communication services that comply with SIP and ITU-T H.323 standards. The terminal has strong flexibility and scalability and can support future wireless communication network technologies and future new multimedia session protocols.
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