Deploying Voice over IP (VoIP) successfully in a data network has some unexpected pitfalls. In previous papers, we’ve explored how to do a Voice Readiness Assessment [1] and looked at focused planning and design tips [2,3]. This paper describes chang

SIP是类似于HTTP的基于文本的协议。SIP可以减少应用特别是高级应用的开发时间。由于基于IP协议的SIP利用了IP网络，固定网运营商也会逐渐认识到SIP技术对于他们的深远意义。-The Session Initiation Protocol (SIP) is an IETF-defined signaling protocol widely used for controlling communication sessions such as voice and video calls ov