- 期刊
A Distributed Management Framework for Enterprise VoIP Networks
並列摘要
VoIP (Voice over Internet Protocol) has attracted tremendous attention since the late 90's. Many call control protocols, such as H.323, SIP, and MGCP, were addressed to perform integrated value-added telecommunication services over IP Networks. By utilizing these services, a user may conveniently make a voice call through the Internet for PC-to-PC, PC-to-Phone, or Phone-to-Phone conversations. Many industries and Internet Telephony Service Providers (ITSPs) have designed and deployed IP telephony networks to provide integrated VoIP services. The state-of-the-art VoIP systems have the capability to largely replace the existing Plain Old Telephone Service (POTS). However, voice sessions over the best-effort IP networks are subject to users' complaining for unavailable or unstable service. The current VoIP management systems put their focuses on the call admission and call quality control most, but seldom have an integrated management. Besides, the VoIP systems have a distributed management requirement for the large-scale and enterprise voice services. These management issues impact the availability of the current VoIP systems. In this paper, an integrated distributed management framework is introduced for managing H.323-based enterprise VoIP systems. Within this framework, the Internet Telephony Gateway (ITG) actively sends out the SNMP-based management information as soon as the call state changes of a session are recognized by the ITG's digital signaling processor (DSP). The call state sequences of a session can be specified by a Finite State Machine (FSM) and used for event-driven fault detection, alarm clustering-based fault isolation, end-to-end call quality monitoring, and accounting management. In addition, a distributed management architecture is also included to accomplish the integrated management for the large-scale VoIP networks.
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