即时通信系统中的音视频处理技术

围绕即时通信系统中的音视频处理技术,以Gstreamer/Farsight框架和Jingle/XMPP通信协议为重点,阐述了即时通信中多媒体音视频通信框架及相关协议.最后以Pidgin软件为例介绍音视频处理框架在即时通信客户端中的实现方法,为即时通信系统中音视频处理功能的开发提供了有效的解决方案.     

SIMPLE和XMPP协议在电信运营商即时通信产品中的应用研究

从现行即时通信软件使用的协议、协议的扩展性、网络负荷、用户认证、与电信网络融合等方面进行了比较.为了进一步验证分析的结果,分别采用两种协议开发了即时通信产品.经过测试可以分析得出两种协议都可以实现即时通信功能,但是适用场景不同,电信运营商要根据自身的产品定位进行选择.     

互动新媒体中的即时通信业务应用进展

对互动新媒体网络中的即时通信业务进行了阐述,介绍了其应用进展,指出了新型即时通信业务的内涵,分析了互动新媒体中的即时通信业务的实际社会和经济效益,详细阐述了互动新媒体中即时通信业务需要解决的问题和基本的解决思路.互动新媒体中的即时通信业务将成为融合网络和未来新媒体经济的重要推动力.     

基于Android的Wi-Fi Direct即时通信系统的设计与实现

目前市场上存在许多即时通信软件,如QQ,WhatsApp,微信等.它们的通信机制是基于传统互联网模式,需连接网络基础设施才能为用户提供服务.现实中连接不到无线网络接入点(AP)或移动网络的情况很常见,因此这种服务并不总是可用的.基于上述背景,设计并实现了一种基于Android平台的Wi-Fi Direct即时通信系统,它可在两个或更多的智能手机之间建立ad-hoc网络来进行即时通信.实验结果显示,该系统具有稳定性好、可靠性高、传输速率高等特点.     

A systematic approach for closer integration of cellular and Internet services

The road to 4G runs through 3G, 2G and 2.5G networks. Until 3G is deployed ubiquitously, 2-2.5G networks and endpoints dominate. Because of their widespread deployment and adoption, these endpoints can help ease the transition to an all-Internet 3G/4G network. We describe a standards-based service architecture and its implementation that allows 2-2.5G endpoints to participate as active actors in realizing Internet services like presence and instant messaging without the endpoints themselves being connected to the Internet. Our architecture also demonstrates service migration, wherein a successful 2G service such as short messaging service morphs transparently into its Internet equivalent, an instant message. Our methodology conserves precious radio access bandwidth by offloading such data services from the bandwidth normally allocated to voice. Our approach, as embodied in the service architecture, is to leverage the best of the Internet protocols (SIP, XML) and technologies (instant messaging, presence) to provide a general framework for personalized service specification and execution.     

关于对MSN文件传输特点及其还原的研究

MSN作为时下国内外都比较流行的一款即时通信软件,拥有比较广泛的用户群。探讨了即时通信软件MSN在文件传输时的特点,重点对MSN传输特定格式文件时的特征给予了分析和研究,针对诸如PDF与PPT等文件格式的文件在明文传输时,因其在文件首部会有特定文件结构特征串,从而可以根据这一特点确定MSN有传输文件的行为。并在基于特定文件格式特征串对MSN传输的文件实现了数据还原,旨在为数据恢复提供新的研究思路。     

一种基于扩展SIP协议的即时通讯系统设计与实现

即时通讯软件系统是当前一个热门应用系统,传统的即时通讯系统大致采用的都是C/S结构并且各自使用了不同的通讯协议,并且在将即时通讯扩展到音频、视频时需要重新定义相关协议。SIP协议是由IETF提出的一个VOIP的控制信令协议。提出了一个基于扩展SIP协议的即时通讯系统原型框架,并介绍了该框架在Linux环境下即时消息发送的实现。     

安全芯片在即时通信系统中的应用研究

安全芯片是一款可以独立进行密钥生成,提供多种加密算法,支持公钥基础设施及数字签名等安全认证及保障功能的产品,目前广泛应用于企业级和商业安全领域,提供身份认证服务和数据安全保护.文中提出一种安全芯片在即时通信系统中的应用方案的设计,通过把安全芯片封装到手机的SD存储卡中,通过安全芯片实现终端用户之间的可信安全交互,从而为手机和移动终端设备构建安全可靠的即时通信系统.     

Messaging platform and services migration

The existing Call Minder infrastructure, has been delivering mass-market requirements for voice messaging services since 1994 and has a roadmap of upgrades delivering a number of value added convergence services, including mobile to fixed SMS text messaging, voice message download to PC and call completion to a VoIP client (BT Communicator) where the destination is engaged on a narrowband ISP connection. BTs messaging portfolio has additionally included e-mail, mobile SMS aggregation, unified messaging and instant messaging. This paper lays out the scope of messaging within BT, details the existing services and provides an overview of the migration impact/activities required for delivery of these and new messaging services over an IP bearer. It will focus on services currently supported by the Call Minder infrastructure.     

基于Android的多媒体信息交互系统客户端软件设计

为了在Android系统上实现即时消息聊天和视频会话,设计了一种基于Android平台的多媒体信息交互软件。提出了一种多媒体交互系统框架,以会话初始化协议(SIP)作为控制信令。阐述了Android多媒体交互客户端的设计,通过SIP协议实现用户登录、列表获取、即时消息传递和视频会话邀请等功能,基于实时传输协议(RTP)实现音视频数据传输,使用Java本地调用(JNI)实现音视频数据编解码,并采用主从流的方式实现音视频播放时的唇音同步。     

关于飞信即时聊天消息监控的研究

飞信是由中国移动推出的一款流行的即时通信软件,支持即时聊天、文件传输、语音／视频对话、短信等网络应用服务,拥有广大的客户群。故在“敏感”网络中,对飞信用户聊天消息进行还原与监控具有十分重要的意义。该文首先分析飞信的即时聊天通信协议和会话流程,其次通过实例分析,提取飞信即时聊天行为的特征字符串并实现聊天消息的还原,最后对还原出的聊天消息提出一种高效查询方案。     

即时通讯工具的影响因素分析——以微信为例

即时通讯（IM）是一种非常受欢迎的互联网应用。在当今中国,有十多个即时通讯产品正占据着市场的主要份额。微信作为即时通讯产品的一种,其所具有的传播有效性、扩散持续性、更新及时性、互动便利性,使得其在即时通讯的市场份额中异军突起。本文主要通过对微信使用者的访谈和对相关文献的整理确定了微信广泛使用的影响因素,即通讯效果、社会影响及休闲娱乐。     

面向企业协作服务的新型业务架构探索与实践

系统基于自研自容器微服务架构,通过自定义轻量化协议实现终端两省一低(省电、省流量、低功耗)平台三高一低(高扩展性、高负载、高可用、低资源消耗),以办公型即时通讯录、企业融合通信、企业办公协同为基础,实现办公的移动化、平台化、社交化、业务化,全面提升员工效率,充分释放组织潜能.     

D/S架构即时型植物信息系统的开发设计

在对植物信息系统的开发设计过程中,提出了结合即时通讯技术,同时弥补C/S与B/S混合结构缺陷的新软件架构D/S(Desktop/Server),并以D/S为框架,建立即时型植物信息系统模型.通过对该模型中各模块的作用及相互关系的分析,阐述了业务流程与数据建模相结合的设计出发点,并通过对系统结构及主要技术实现的剖析,进一步说明该设计方案的优越性和实用性.     

SimPhony — A Voice Communication Tool for Distributed Workgroups

This paper describes SimPhony — a mobile, voice-controlled, voice communication system built on a PDA and designed specifically for distributed workgroups. SimPhony supports one-to-one or one-to-many communication with voice instant messages or synchronous audio transmitted over an IEEE802.11b wireless network, and it transitions between different communication styles as messages become more frequent. The SimPhony interface looks much like an instant messaging client but is accessible through a voice or visual interface on the PDA or a voice interface accessible by any telephone. SimPhony was designed specifically for, and with critique from, technicians working in a large semiconductor fabrication plant.     

Involuntary migration in cyberspaces: The case of MSN messenger discontinuation

Instant messaging (IM) is one of the most popular Web 2.0 tools for the facilitation of synchronous communication, collaboration, and social interaction among users. The chances that incumbent instant messaging (IM) users will suffer from involuntary switching have increased because competition can eliminate their service/technology providers. This concern leads to our research question: what factors influence IM users’ decision-making in involuntary switching? In light of the above concerns, this study aims to extend the push–pull–mooring (PPM) framework and the migration theory to the context of service involuntary switching by incorporating the notions of network effects and regret. Our model theorizes that four constructs of network effects (referent network size, future expectation, perceived complementary, and perceived compatibility), similarity and innovativeness (pull factors), switching cost (mooring factors), and three push factors regarding migration plan and outcome (dissatisfaction with technical quality and information quality of the migration plan and regret) can affect users’ intention to migrate to other IM services and subsequently alter their migration behaviors. This hypothetical model used in this study has been empirically validated using data collected from 381 IM users. Implications for theory and practice are also discussed.     

移动互联网差异化融合通信业务方案研究

分析移动互联网产业链上不同角色提供的即时通信业务的主要功能、市场定位、盈利模式等,结合运营商自身情况,研究运营商的移动互联网差异化融合通信业务方案,为运营商在通信服务领域的业务设计提供新思路。     

The Session Initiation Protocol: Internet-centric signaling

The Session Initiation Protocol (SIP) provides advanced signaling and control functionality for a wide variety of multimedia services. SIP can efficiently and scalably locate resources based on a location-independent name and then negotiate session characteristics. It can find use in applications ranging from Internet telephony and conferencing to instant messaging, event notification, and the control of networked devices. We summarize the main protocol features and describe a range of extensions currently being discussed within the Internet Engineering Task Force     

统一通信简述

随着通信技术的快速发展和企业通信基础设施的建设,用户尤其是企业用户提出了更多的业务要求。统一通信业务提供了一个融合语音、数据、多媒体的业务解决方案,使得用户任何时候,任何地点都能灵活的使用各种通信业务。一个好的统一通信业务平台包括VoIP通信能力、呈现业务能力、即时消息业务能力以及众多的业务。同时为了实现和企业基础设施无缝的融合,统一通信业务平台可以提供开放的业务接口。     

Talk is cheap, text is cheaper [mobile messaging]

E-mail was the first killer application for the Internet-now messaging is coming to cellphones. How does a software application go from zero to 100 million users in a couple of years? One way is to be built into Windows. Another is for the world's largest cellphone manufacturers to make it a standard. That has not happened yet, but it's about to. Three titans of the mobile world, Nokia, Motorola, and Ericsson, are behind a developing standard for instant messaging (IM) between cellphones. Called Wireless Village, it was approved in February as Draft 1.0 by a consortium that includes more than 150 equipment manufacturers, and could be implemented in new cellphones by early fall. Meanwhile, a slightly different messaging mode, short message service (SMS), has already crossed the Atlantic from Europe. In recent months, the leading US wireless carriers have started to promote the service. This could be good news for investors and for the carriers themselves-so good, in fact, that it is said the abbreviation really stands for "significant money streams". European mobile carriers are reporting that SMS accounts for as much as 9 percent of revenues and 20 percent of profits