很详细的介绍sip的文章，可以作为通信变成的参考，值得学习。...

实时语音信息隐藏的软件。在VOIP通信流中进行及时消息的信息隐藏。UNIX环境下使用。-Real-time voice information hiding software. VOIP communications in the timely flow of news information hiding. UNIX environment.

高速Viterbi处理器的并行算法和结构-High-speed Viterbi processor parallel algorithm and structure

this code is help you to draw Fourier Series . with this code you can change some variable and explain what change for education.

GSM手机（SMS消息、电话本）开发库C++源代码，通过GSM调制解调器或基于IrDA设备的GSM标准：ETSI GSM 7.07，ETSI GSM 7.05提供NIX，Win系统编码PDU。支持诺基亚61、62、71、8***、西门子S10、M20、35i、爱立信SH888、Wavecom WM02

通过串行口访问Modbus现场控制网络,概述了modbus相关内容-Modbus serial port access through the on-site control network, an overview of relevant content modbus

经过测试，在vc++下编译通过，并且包含lib库，有需要的同志可以直接使用-After testing, vc under compile, and includes lib work, it needs direct access to comrades

VHDL语言实现了IS-95标准中的48阶成型滤波器。工作速率80Mbps。接收发送端均可使用。-VHDL Language realize the IS-95 standard of 48 bands forming filter. Work rate of 80Mbps. Can be used to receive the sending end.

设载波频率为20Hz，信息速率为2Baud,用MatLab画出QPSK信号波形。-Carrier frequency set to 20Hz, the information rate of 2Baud, using MatLab draw QPSK signal waveform.

how to set up a pptp vpn connection? detailed steps with screen-shots

sms设置GPRS接入点，WAP网关 C源程序源码-GPRS handsets installed access points, WAP Gateway source C source