共查询到17条相似文献,搜索用时 453 毫秒
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讨论了SIP协议以及基于SIP协议的IP电话增值业务实现技术 ,并对SIPCGI、CPL、SIPServlets、JAINAPIs等几种SIP编程技术进行了分析与比较 ,归纳总结了开发IP电话增值业务的一般方法 相似文献
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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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针对VHF话音通信无法支持远距离通信的问题,对VOIP技术进行了研究。提出了一种
基于会话初始协议(SIP)的VHF话音通信远程接入系统的实现方法,给出了系统体系架构,
以及接入控制设备和远程控制软件的参考设计。系统中接入控制设备和远程控制软件实现
SIP用户代理功能,从而提供接入SIP系统的能力。仿真结果证明了该方法的有效性,从而为
VHF话音通信系统的应用范围扩展提供了新的思路。 相似文献
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本文首先简要介绍了IP传真的现存标准,指出了他们考虑问题的立足点:一个是建立在基于电子邮件的实用基础上的;一个是建立在IP网络的低误码率和高速率的理想化基础上的,以及由此带来的不足,然后提出了一种基于Internet现状的IP传真新观点,并分析了它的优点。 相似文献
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This article presents a strategic intent perspective (SIP) to analyze the foreign acquisitions made by Chinese firms. It suggests that Chinese firms strategically use cross-border acquisitions to achieve goals, such as acquiring strategic capabilities to offset their competitive disadvantages and leveraging their unique ownership advantages, while making use of institutional incentives and minimizing institutional constraints. The SIP is supported by the evidence from three firms that we studied, where dozens of interviews were conducted, including the one with the founder of Lenovo. This study contributes to extant international business theories by incorporating the SIP to examine internationalization strategies of firms from developing countries. 相似文献
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Simplice A. Asongu 《Journal Of African Business》2013,14(1):7-18
In the first macroeconomic empirical assessment of the relationship between mobile phones and finance, the author examines the correlations between mobile phone penetration and financial development using two conflicting definitions of the financial system in the financial development literature. With the traditional International Financial Statistics (IFS) (2008) definition, mobile phone penetration has a negative correlation with traditional financial intermediary dynamics of depth, activity, and size. However, when a previously missing informal-financial sector component is integrated into the definition, mobile phone penetration has a positive correlation with informal financial development. Three implications result: There is a growing role of informal finance; mobile phone penetration may not be positively assessed at a macroeconomic level by traditional financial development indicators; and it is a wake-up call for scholarly research on informal financial development indicators that will orient monetary policy. 相似文献
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本文介绍了一个全新的概念:个人网关(PG:Personal Gateway)。它可以克服以往IP电话的种种缺陷,为个人用户提供单独的一路IP语音服务,而且使用户在上网的同时也可通过话机方便地拨打和接听电视。本文着重讨论了个人网关的设计思想、原理、体系结构、应用环境和前景。 相似文献
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电子商务自出现以来发展势头强劲,网络购物的用户不断增长。与此同时,电子支付工具也得到快速发展,在智能手机出现后,由于手机用户的广泛性,手机移动支付将成为未来发展的主流趋势,具有更广阔的市场。手机支付方便快捷,但是作为一种网络支付方式,却受制于通信网络、标准化和安全性等问题。手机支付产业的良性发展需要政府、金融机构、电信运营商与其它相关机构协作,建立移动支付产业链,为手机用户提供规范安全的支付环境。 相似文献
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The government‐linked companies (GLCs) were among the earliest Singapore firms to venture into China and tap into its rapid economic growth. Riding on their expertise in services and manufacturing, the financially strong GLCs have been able to penetrate the mainland market and gain a firm foothold in China. However, their success has not come easy. Many of the GLCs experienced many difficulties and had to learn to deal with the complexities of doing business in the mainland. This article uses an analytical framework to explore the difficulties that the GLCs face, with the Singapore‐Suzhou Industrial Park (SIP) as a case study. The article also examines if there has been a change in the business strategies after the SIP experience, offering some useful lessons for companies investing in China. © 2009 Wiley Periodicals, Inc. 相似文献