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SIP协议与NMVS、下一代网络(NGN)相比,拥有简单灵活、易实现、扩展性好等多方面优点。SIP标准定义SIP(Session Initiation Protocol会话初始协议)的开发目的是用来帮助提供跨越因特网的高级电话业务。因特网电话(IP电话)正在向一种正式的商业电话模式演进,SIP就是用来确保这种
Compared with NMVS and next generation network (NGN), SIP protocol has many advantages such as simple and flexible, easy to implement and good scalability. SIP Standard Definition Session Initiation Protocol (SIP) is designed to help provide advanced telephony services across the Internet. Internet telephony (IP telephony) is evolving into a formal business telephony model that SIP is used to ensure