sip协议中sdp消息姐学习笔记，介绍了sdp消息的组成

在开发 VoIP 系统时，主要考虑的一个方面就是连接到模拟电话的接口。设计人员必须了解 PSTN 中存在的电话接口要求，因为它们必须在 VoIP 系统中得到支持。本文将重点介绍连接到标准 POTS 电话的两种最常用接口：Foreign eXchange Subscriber (FXS) 与 Foreign eXchange Office (FXO)。重点说明了设计人员在为 VoIP 小区网关的模拟电话接口提供支持时可能面临的某些挑战。-In the development of VoIP system, one aspect of the main considerations is connected to the analog telephone interface. Designers must understand the existing PSTN telephone interface requirements, because they are in the VoIP system must be supported. This article will focus on the standard POTS telephone connected to the two most commonly used interface: Foreign eXchange Subscriber (FXS) and Foreign eXchange Office (FXO). Focusing on the design staff in the Residential Gateway for VoIP analog telephone interface may provide support to some of the challenges faced.

一个基于h.323协议，QT界面的网络视频(voip)工具-an agreement on h.323, QT interface of Network Video (1/1/2006) tool

voip技术现在已成为国内外的热点话题，实时语音通信对于我们来说是很重要的。voip技术的应用当然也不在话下。 -voip technology has become a hot topic at home and abroad, real-time voice communication for us is very important. Voip technology applications course presentations.

SIP_ISUP，SIP ISUP互联互通协议部分，对于学习NGN软交换之间的协议流程很有帮助。-SIP_ISUP, SIP ISUP protocol interoperability of NGN Softswitch to study the agreement between the flow of great help.

这是一个用vc开发的基于CMPP的短信收发程序-This is a development with vc CMPP based on the short message TX procedures

在ip电话或者视频通讯开发中，常常需要穿越nat，stun是个不错的选择-In the ip phone, or video communication development, often through the nat, stun is a good choice

H.323， 基于VIS H.323 dll library的视频会议系统-H.323, based on the VIS H.323 dll library of video conferencing systems

一个用java实现的局域网语音聊天系统，包括服务器端和客户端，可以实现文字聊天，语音聊天，文件传输等功能，并实现了密码验证。-used to achieve a LAN voice chat system, including the server and client, can achieve a text chat, voice chat, file transfer and other functions, and to achieve a password verification.

sipp源代码，sip协议测试桩，附场景文件-SIPP source code, sip protocol test piles, attached to the scene file

IP电话演示，Delphi7编译通过-IP telephony demonstration compile Delphi7