SIP protocol application on NGN topology is analyzed, besides I give particular study on the SIP message structure, SDP message, and SIP call/register process based on the RFC3261 standard.

• 论文分析了SIP应用在NGN组网中的地位，同时依据RFC3261标准对SIP消息体结构、SDP消息、SIP的呼叫与注册流程进行了详细的研究。