This study focuses on testing and quality measurement and analysis of VoIPv6 performance. A client, server codes were developed using FreeBSD. This is a step before analyzing the Architectures of VoIPv6 in the current...This study focuses on testing and quality measurement and analysis of VoIPv6 performance. A client, server codes were developed using FreeBSD. This is a step before analyzing the Architectures of VoIPv6 in the current internet in order for it to cope with IPv6 traffic transmission requirements in general and specifically voice traffic, which is being attracting the efforts of research, bodes currently. These tests were conducted in the application level without looking into the network level of the network. VoIPv6 performance tests were conducted in the current tunneled and native IPv6 aiming for better end-to-end VoIPv6 performance. The results obtained in this study were shown in deferent codec's for different bit rates in Kilo bits per second, which act as an indicator for the better performance of G.711 compared with the rest of the tested codes.展开更多
针对集中式基于网际互连协议的语音传输(Voice over Internet Protocol,VoIP)语音通信交换系统(Voice Communication Switching System,VCCS)的互操作性需求,提出一种基于VoIP技术的中继通信解决方案。在集中式VoIP通信架构的基础上构...针对集中式基于网际互连协议的语音传输(Voice over Internet Protocol,VoIP)语音通信交换系统(Voice Communication Switching System,VCCS)的互操作性需求,提出一种基于VoIP技术的中继通信解决方案。在集中式VoIP通信架构的基础上构建中继通信模型,结合局向管理、冠号管理、路由管理以及会议管理等模块的协同运行给出VoIP中继通信的业务处理流程,并详细阐述中继会议的核心模块。最后,通过两种异型语音通信交换系统的中继通信对比测试,验证了文章提出的VoIP中继通信方法的可靠性和互操作性。展开更多
This paper evaluates the performance of Internet Protocol Security (IPSec) based Multiprotocol Label Switching (MPLS) virtual private network (VPN) in a small to medium sized organization. The demand for security in d...This paper evaluates the performance of Internet Protocol Security (IPSec) based Multiprotocol Label Switching (MPLS) virtual private network (VPN) in a small to medium sized organization. The demand for security in data networks has been increasing owing to the high cyber attacks and potential risks associated with networks spread over distant geographical locations. The MPLS networks ride on the public network backbone that is porous and highly susceptible to attacks and so the need for reliable security mechanisms to be part of the deployment plan. The evaluation criteria concentrated on Voice over Internet Protocol (VoIP) and Video conferencing with keen interest in jitter, end to end delivery and general data flow. This study used both structured questionnaire and observation methods. The structured questionnaire was administered to a group of 70 VPN users in a company. This provided the study with precise responses. The observation method was used in data simulations using OPNET Version 14.5 Simulation software. The results show that the IPSec features increase the size of data packets by approximately 9.98% translating into approximately 90.02% effectiveness. The tests showed that the performance metrics are all well within the recommended standards. The IPSec Based MPLS Virtual private network is more stable and secure than one without IPSec.展开更多
随着互联网技术的进步,语音通信也经过了技术变革。基于IP的语音传输(Voice over Internet Protocol,VoIP)技术在近年来成为社会关注的热点话题,逐渐广泛应用于日常生产和生活。VoIP语音通信技术不仅信息传输质量较好,还满足了目前的语...随着互联网技术的进步,语音通信也经过了技术变革。基于IP的语音传输(Voice over Internet Protocol,VoIP)技术在近年来成为社会关注的热点话题,逐渐广泛应用于日常生产和生活。VoIP语音通信技术不仅信息传输质量较好,还满足了目前的语音通信需要,对于语音通信技术的进一步发展有着积极的促进作用。基于VoIP语音通信技术进行研究与问题分析,以供参考。展开更多
为提高基于IP的语音传输(Voice over Internet Protocol,VoIP)音频通信系统的可用性,设计并实现了一款基于会话初始协议(Session Initiation Protocol,SIP)的高可用VoIP音频通信系统。首先,基于虚拟IP技术,建立系统在路由层的高可用框...为提高基于IP的语音传输(Voice over Internet Protocol,VoIP)音频通信系统的可用性,设计并实现了一款基于会话初始协议(Session Initiation Protocol,SIP)的高可用VoIP音频通信系统。首先,基于虚拟IP技术,建立系统在路由层的高可用框架。其次,在SIP协议栈层搭建SIP服务器集群,实现系统在网络音频通信业务层的高可用和负载均衡。最后,使用关系型数据库,成功搭建集群在数据一致性方面的高可用模型。实验结果表明,通过该设计可以有效降低VoIP通信系统的故障停机时间,同时可以提高系统的业务负载能力。展开更多
IP的语音传输(Voice over Internet Protocol,VoIP)技术是一种基于网络的语音技术,它可以将语音信号转换成数据流,并在互联网上传输。VoIP技术与Call Center的融合使用户在通话时能更加方便、快捷地使用互联网,节省时间和费用,实现语音...IP的语音传输(Voice over Internet Protocol,VoIP)技术是一种基于网络的语音技术,它可以将语音信号转换成数据流,并在互联网上传输。VoIP技术与Call Center的融合使用户在通话时能更加方便、快捷地使用互联网,节省时间和费用,实现语音信号与数据流的同时传输,提高通话质量和效率。同时,技术融合可以解决传统呼叫中心面临的一些挑战,如服务质量下降、成本上升等问题。展开更多
针对目前IP电话语音质量难以准确评价及测量的情况,研究了一种基于E-Model的VoIP(voice over internet protocol)语音质量的测量模型。该模型考虑了IP网络中大多数的网络损伤因素,并能容易地计算出不同丢包率、不同的延迟和抖动所对应的...针对目前IP电话语音质量难以准确评价及测量的情况,研究了一种基于E-Model的VoIP(voice over internet protocol)语音质量的测量模型。该模型考虑了IP网络中大多数的网络损伤因素,并能容易地计算出不同丢包率、不同的延迟和抖动所对应的MOS(mean opinion score)值。测试出IP电话在网络中质量变化情况,有利于IP网络中资源的调整和VoIP质量的提高。展开更多
为满足国家有关职能部门对网络电话(voice over internet protocol,VoIP)合法监测的需要,通过对会话初始化协议(session initiation protocol,SIP)特点的研究和分析,并对基于SIP的VoIP流量的识别方法、动态会话的提取算法和网络监听流...为满足国家有关职能部门对网络电话(voice over internet protocol,VoIP)合法监测的需要,通过对会话初始化协议(session initiation protocol,SIP)特点的研究和分析,并对基于SIP的VoIP流量的识别方法、动态会话的提取算法和网络监听流程进行重点阐述,提出一个基于SIP的VoIP监听模型的设计方案,详细介绍了各个功能模块,并结合libpcap库实现了该模型。实验表明,该模型可以有效识别VoIP流量。展开更多
文摘This study focuses on testing and quality measurement and analysis of VoIPv6 performance. A client, server codes were developed using FreeBSD. This is a step before analyzing the Architectures of VoIPv6 in the current internet in order for it to cope with IPv6 traffic transmission requirements in general and specifically voice traffic, which is being attracting the efforts of research, bodes currently. These tests were conducted in the application level without looking into the network level of the network. VoIPv6 performance tests were conducted in the current tunneled and native IPv6 aiming for better end-to-end VoIPv6 performance. The results obtained in this study were shown in deferent codec's for different bit rates in Kilo bits per second, which act as an indicator for the better performance of G.711 compared with the rest of the tested codes.
文摘针对集中式基于网际互连协议的语音传输(Voice over Internet Protocol,VoIP)语音通信交换系统(Voice Communication Switching System,VCCS)的互操作性需求,提出一种基于VoIP技术的中继通信解决方案。在集中式VoIP通信架构的基础上构建中继通信模型,结合局向管理、冠号管理、路由管理以及会议管理等模块的协同运行给出VoIP中继通信的业务处理流程,并详细阐述中继会议的核心模块。最后,通过两种异型语音通信交换系统的中继通信对比测试,验证了文章提出的VoIP中继通信方法的可靠性和互操作性。
文摘This paper evaluates the performance of Internet Protocol Security (IPSec) based Multiprotocol Label Switching (MPLS) virtual private network (VPN) in a small to medium sized organization. The demand for security in data networks has been increasing owing to the high cyber attacks and potential risks associated with networks spread over distant geographical locations. The MPLS networks ride on the public network backbone that is porous and highly susceptible to attacks and so the need for reliable security mechanisms to be part of the deployment plan. The evaluation criteria concentrated on Voice over Internet Protocol (VoIP) and Video conferencing with keen interest in jitter, end to end delivery and general data flow. This study used both structured questionnaire and observation methods. The structured questionnaire was administered to a group of 70 VPN users in a company. This provided the study with precise responses. The observation method was used in data simulations using OPNET Version 14.5 Simulation software. The results show that the IPSec features increase the size of data packets by approximately 9.98% translating into approximately 90.02% effectiveness. The tests showed that the performance metrics are all well within the recommended standards. The IPSec Based MPLS Virtual private network is more stable and secure than one without IPSec.
文摘随着互联网技术的进步,语音通信也经过了技术变革。基于IP的语音传输(Voice over Internet Protocol,VoIP)技术在近年来成为社会关注的热点话题,逐渐广泛应用于日常生产和生活。VoIP语音通信技术不仅信息传输质量较好,还满足了目前的语音通信需要,对于语音通信技术的进一步发展有着积极的促进作用。基于VoIP语音通信技术进行研究与问题分析,以供参考。
文摘为提高基于IP的语音传输(Voice over Internet Protocol,VoIP)音频通信系统的可用性,设计并实现了一款基于会话初始协议(Session Initiation Protocol,SIP)的高可用VoIP音频通信系统。首先,基于虚拟IP技术,建立系统在路由层的高可用框架。其次,在SIP协议栈层搭建SIP服务器集群,实现系统在网络音频通信业务层的高可用和负载均衡。最后,使用关系型数据库,成功搭建集群在数据一致性方面的高可用模型。实验结果表明,通过该设计可以有效降低VoIP通信系统的故障停机时间,同时可以提高系统的业务负载能力。
文摘IP的语音传输(Voice over Internet Protocol,VoIP)技术是一种基于网络的语音技术,它可以将语音信号转换成数据流,并在互联网上传输。VoIP技术与Call Center的融合使用户在通话时能更加方便、快捷地使用互联网,节省时间和费用,实现语音信号与数据流的同时传输,提高通话质量和效率。同时,技术融合可以解决传统呼叫中心面临的一些挑战,如服务质量下降、成本上升等问题。
文摘针对目前IP电话语音质量难以准确评价及测量的情况,研究了一种基于E-Model的VoIP(voice over internet protocol)语音质量的测量模型。该模型考虑了IP网络中大多数的网络损伤因素,并能容易地计算出不同丢包率、不同的延迟和抖动所对应的MOS(mean opinion score)值。测试出IP电话在网络中质量变化情况,有利于IP网络中资源的调整和VoIP质量的提高。
文摘为满足国家有关职能部门对网络电话(voice over internet protocol,VoIP)合法监测的需要,通过对会话初始化协议(session initiation protocol,SIP)特点的研究和分析,并对基于SIP的VoIP流量的识别方法、动态会话的提取算法和网络监听流程进行重点阐述,提出一个基于SIP的VoIP监听模型的设计方案,详细介绍了各个功能模块,并结合libpcap库实现了该模型。实验表明,该模型可以有效识别VoIP流量。
