共查询到19条相似文献,搜索用时 468 毫秒
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随着IP电话和视频通信的发展,H.323和SIP作为IP多媒体通信领域中被广泛采纳的两种信令控制协议,受到业界的普遍重视。如何有效地实现这两种协议之间的互通,成为近年来国内外研究的热点。本文在简要分析H.323和SIP互通要求的基础上,提出了两者互通的实现方案,并对互通需要解决的关键问题进行了讨论。 相似文献
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首先介绍了SIP协议,包括其功能、系统基本组成、消息格式,然后设计了软件的三大模块:用户界面模块、SIP UA模块、语音通信模块,并使用编程工具V isual C 6.0、SIP协议栈OSIP、EXOSIP及RTP协议栈W inRTP实现了该软电话。测试结果表明,该SIP软电话在局域网环境下具有良好的通话质量。 相似文献
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网络电话、IP电话、固话短信等各种增值业务,增加了固话的魅力。据统计,在国外,固网增值业务收入占固网总收入的30%。然而目前,我国固网增值业务收入不足固网总收入的5%。 相似文献
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宽带电话即宽带IP电话业务.是指基于宽带IP技术通过宽带传输网络.包括主叫和被叫业务的电话业务.其发起端和接收端均可为基于IP的产品。并且可以和传统电话互连互通的“电话业务”。这里所谓的“电话业务”包含着狭义和广义两层含义。狭义的“宽带电话”是指基于IP技术和宽带传输网络和“电话机”为载体的话音传输业务.其核心和主导业务是话音传输。 相似文献
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CM-IMS是一种叠加在现有网络上的基于IP承载实现多媒体业务的网络结构,是应对全业务运营竞争的重要技术。面向企业的语音业务可以迁移至CM-IMS承载,首要解决业务接入控制问题。介绍了CM-IMS网络体系及SIP协议的基本理论,对传统企业语音专线的业务接入现状进行描述,分析基于CM-IMS组网的业务接入控制需求,重点针对CM-IMS提供的多种鉴权机制进行分析,以及对数据分组网承载IMS业务的效果分析,提出3个适合企业语音业务接入的控制策略,通过应用实侧证明策略实施的可行性。 相似文献
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近年来,由于移动通信业务的迅猛发展,使传统的固定电话业务的发展受到极大的冲击。为了在竞争激烈的市场环境中立足,固定电话运营商不得不转变经营观念,在树立用户意识、服务意识、市场意识、竞争意识的同时,不断推出增值新业务。而增值新业务能否为消费者所接受,在很大程度上取决于增值业务的促销策略。 相似文献
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介绍了SOP(System On Package)集成技术,并与传统系统集成方法以及SOC(System O
n
Chip)、MIP(Module In Package)、MCM(Multi Chip Module)、SIP(System I
n Package)
等微封装、微集成技术进行了比较和分析,揭示了SOP小型化、低成本、高可靠性、高性能
特点。对SOP在毫米波系统应用、新材料和新工艺的进展进行了总结,结果表明SOP在毫米波
系统中具有良好的应用前景。 相似文献
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本文从诸因素相互关联的角度,针对IP电话认证、计费实现中所牵涉到的四个主要问题进行了认真的分析,提出了解决方案,论证了方案的可行性和先进性,并在实际产品中通过测试。 相似文献
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This study examines the effect of users' prior experience on the adoption behaviour in the Internet protocol television (IP TV) service domains. This article proposes a new acceptance model for an IP TV service considering the moderating effect of experience and verifies the model with an empirical study. Respondents are classified into either experienced or inexperienced groups according to their prior experience with the IP TV service. The results indicate that motivational factors used in our study affect behavioural intention. In addition, this study shows that the influence of extrinsic motivational factors on the behavioural intention are stronger for the experienced group than the inexperienced group and the influence of intrinsic motivational factors on the behavioural intention are stronger for the inexperienced group than the experienced group. This article concludes with study implications, as well as limitations and future research directions. 相似文献
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在介绍移动IP技术和MPLS技术特点的基础上,提出了移动IP与MPLS的融事方案。利用MPLS的标记交换代替传统的IP转发,能降低传输开,提高移动IP的可扩展性,同时为MPLS提供移动性支持。 相似文献
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本文是基于软交换(SoftSwitch)技术的发展而提出的,从网络融合的角度分析了SIP和ISUP互通单元(IWU,即Interworking Unit)的结构模型,着重介绍了IWU上实现SIP和ISUP互通的原则和机制,为实现PSTN向软交换网络的平滑过渡提供了可行的解决方案。 相似文献
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本文结合网络传输技术的发展趋势,在介绍IP over SDH技术的基础上,详细分析了IP over SDH在技术和应用等各方面的优势及存在的某些局限性,探讨了网络传输技术今后的发展方向。 相似文献
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This article tells the story of growth and diversification at Sonae, now Portugal's largest company. Publicly quoted but still majority-controlled by its long-standing Chairman and CEO, Belmiro de Azevedo, it was founded in 1959 in the wood products business. It expanded from the 1980s to become the largest retail group in Portugal and has recently taken on the two incumbents in Portugal's mobile telephony market. It won the third license auction in 1997 and achieved a 22% market share within three years. As the biggest part of Sonae's technology investments, the move into mobile telephony played a big part in launching the Sonae share price on a roller-coaster path that has only recently steadied. The Sonae story illustrates the potential importance of long-term charismatic leadership and strategic vision by one person. It also provides insights into the factors that can help diversification to work. 相似文献
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Robert Lawrence Afutu-Kotey Katherine V. Gough George Owusu 《Journal Of African Business》2017,18(4):476-491
Despite increasing research interest in the mobile telephony sector, only a few studies have devoted attention to informal businesses in the sector. Using qualitative field data collected on young mobile telephony entrepreneurs in Accra, this paper argues that despite the businesses being ‘informal’, they cannot be dismissed as ‘necessity’ enterprises unworthy of support. On the contrary, many young entrepreneurs have aspirations which are influencing their desire to stay in business. The article thus questions the bifurcated nature of entrepreneurial motivations, using the burgeoning mobile telephony sector as a case study, and draws out implications for policy support for youth-run businesses in the informal sector generally. 相似文献