Mobile VoIP

Design and implementation of a SIP-based secure mobile VoIP system; including authentication, key management and end-to-end voice encryption, as well as the test and evaluation of its functionality, real-time performance and security.

设计并实现了基于SIP的移动VoIP安全系统，主要功能包括身份认证、密钥管理以及语音的端到端加解密，并对系统的功能性、实时性和安全性等进行了详细的测试与评估。

The Research of Mobile VOIP Handoff and APs Load Balance in Wireless Local Area Networks

无线局域网中移动VOIP切换及AP负载平衡研究

To provide international roaming services to mobile phones, domestic telephone VOIP Service.

提供移动电话国际漫游服务, 国内电话VOIP服务.

Over the connectionless IP network, the SIP-based VoIP system provides VoIP services with software exchanges, performing both fixed and mobile telephone switching and transmission functions, only showing differ-ence at access modes.

在无连接的IP网上，基于SIP的VoIP系统用软件交换机提供VoIP业务，既可完成固定电话的交换传输，也可完成移动电话的交换传输，差别仅仅是接入方式不同。

Through this system, mobile VoIP users based on SIP are easily able to locate and establish multi-media session, then complete the voice interaction.

本文设计实现了基于SIP的网络服务组件，通过该系统基于SIP的移动VoIP用户可以很简单的进行定位和建立多媒体会话，进而完成语音交互过程。

The core of this paper is analysis of mobile ad hoc network VoIP performance.

本文的研究核心就是分析移动自组织网上VoIP的传输性能。