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随着IP网络的快速发展与普及,VoIP技术也逐渐走入人们的日常生活。文章分析了VoIP目前的应用情况以及关键技术.介绍了VoIP技术中新一代的SIP协议与RTP协议的工作原理,并就宴际业务实例对VoIP业务进行了分析。 相似文献
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该文分析了基于SIP的VoIP安全问题,阐述了SIP基本网络模型和多层安全认证机制,提出了一种基于SIP的企业级VoIP安全框架,分析表明该框架可以消除VoIP通信存在的安全隐患。 相似文献
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针对电力系统电话调度网络阻塞问题以及新一代电力系统的建设需求,研究了基于VoIP技术的多网融合电网调度指挥系统。该系统采用基于SIP协议的VoIP技术,在C/S模式的基础上构建了用户代理模型和网络服务器模型。同时,利用FreeSwitch作为混合组网的通信服务器,完成了网络交换机、PBX网关以及用户界面多媒体服务器三体合一。在此基础上,用中继语音板卡实现了电话网络和IP网络之间的信息交互,并采用WebRTC的HT-ML5.0技术构建了电网调度指挥系统的网页客户端。本研究内容对于缓解调度电话通信压力,有效提高调度电话指挥通信的效率具有重要意义。 相似文献
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SIP协议具有简单、灵活的技术特点,成为下一代网络中语音信息传输的主要形式.研究基于SIP协议的VoIP体系结构,描述SIP消息结构、呼叫流程,针对基于SIP的VOIP与PSTN之间协议转换作了深度分析. 相似文献
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目前现有的VoIP系统一般均基于H.323协议族所定义的协议模型,本文提出基于软交换技术的VoIP系统方案,重点研究了支持SIP终端的软交换解决方案,通过方案比较,说明了基于软交换技术的VoIP方案的优势. 相似文献
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随着VoIP(Voice over Internet Protocol)的迅速发展,作为VoIP的主流协议的SIP协议成为各大运营商和设备商所关注的热点,出现了许多用SIP协议来通信的软终端。为了可以引入更多的用户对呼叫中心的使用,提出了一种基于SIP协议和CSTA呼叫模型的实现方法,将SIP协议和CSTA呼叫模型结合起来,用SIP协议来实现终端和服务器的通信并实时对外汇报终端状态的变化,这样就可以实现第三方监控,并通过测试验证了其可行性。 相似文献
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随着VoIP(Voice over Internet Protocol)的迅速发展,作为VoIP的主流协议的SIP协议成为各大运营商和设备商所关注的热点,出现了许多用SIP协议来通信的软终端.为了可以引入更多的用户对呼叫中心的使用,提出了一种基于SIP协议和CSTA呼叫模型的实现方法,将SIP协议和CSTA呼叫模型结合起来,用SIP协议来实现终端和服务器的通信并实时对外汇报终端状态的变化,这样就可以实现第三方监控,并通过测试验证了其可行性. 相似文献
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提出一种SIP信令协议的入侵检测方法,用以加强VoIP业务环境的安全。重点对基于SIP的VoIP业务环境的安全威胁和业务流量分析,利用数据挖掘算法和改进的贝叶斯算法构建针对SIP下的入侵检测模型。实验结果表明,该方法可以对VoIP业务环境下的网络攻击进行有效检测。 相似文献
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随着IP网络的快速发展和普及,基于IP的语音技术得到广泛的应用。本文先对VoIP通信系统及其关键技术进行分析,实现SIP电话服务器和基于ARM10芯片的SIP嵌入式终端,对其系统架构和软硬件实现进行阐述,最后对系统的总体性能进行分析。 相似文献
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Dimitris Gritzalis Panagiotis Katsaros Stylianos Basagiannis Yannis Soupionis 《International Journal of Information Security》2012,11(2):121-135
Anti-SPIT policies counter the SPam over Internet Telephony (SPIT) by distinguishing bots launching unsolicited bulks of VoIP
calls from human beings. We propose an Anti-SPIT Policy Management mechanism (aSPM) that detects spam calls and prevents VoIP
session establishment by the Session Initiation Protocol (SIP). The SPIN model checker is used to formally model and analyze
the robustness of the aSPM mechanism in execution scenarios with parallel SIP sessions. In case of a possible design flaw,
the model checker provides a trace of the caught unexpected behavior (counterexample), that can be used for the revision of
the mechanism’s design. Our SPIN model is parameterized, based on measurements from experiments with VoIP users. Non-determinism
plays a key role in representing all possible anti-SPIT policy decisions, in terms of the SIP messages that may be exchanged.
The model checking results provide evidence for the timeliness of the parallel SIP sessions, the absence of deadlocks or livelocks,
and the fairness for the VoIP service users. These findings ensure robust anti-SPIT protection, meaning that the aSPM mechanism
operates as expected, despite the occurrence of random SPIT calls and communication error messages. To the best of our knowledge,
this is the first analysis for exhaustively searching security policy flaws, due to complex interactions between anti-SPIT
measures and the SIP protocol services. 相似文献
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利用SIP事件通告机制这一扩展,提出了一种基于SIP的VoIP非语音信息扩展的应用方案,描述了该方案的设计原理,讨论了一些方案实现的技术要点.该设计方案结合了XML技术,结构清晰,故具有较强的扩展性.在VoIP系统中,该方案实现的扩展功能使用户了解当前其他用户的通信状态,避免了一些呼叫事故的发生. 相似文献
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In the era of IP-based service, people expect a simple, cheap, and competent Voice over IP (VoIP) service as an alternative
of the traditional voice over PSTN. The introduction of the SIP protocol realizes the expectation. Following the cost saving
spirit of VoIP, we focus on studying inexpensive high availability solutions for the SIP-based VoIP Service. In this paper,
Peer-to-Peer (P2P) based and DN-LB based schemes are mainly compared in the paper. A P2P-based scheme enables an inexpensive
high availability solution to the VoIP service by the shared computation resources form P2P nodes. Such a P2P-based solution
may be appropriate for an individual VoIP user. However, a caller may take a large volume of messages to find out a callee
via the proxy nodes in the P2P network. This inherent property of a P2P network may induce the message overhead and long call
setup delay. Based on above, another inexpensive scheme, which is a probing-based name resolution solution, is proposed to
achieve high availability and load balancing for the VoIP service. We tag the probing mechanism onto the open source project
Domain Name Relay Daemon (DNRD) to become a domain name resolution based load balancer (DN-LB). With DN-LB, all request messages
from clients can be fairly distributed to all failure-proof proxy servers in the server farm without using any additional
costly intermediate network device and changing the standard SIP architecture. Such a DN-LB based solution may be a good choice
for a VoIP service provider. 相似文献