A Dynamic Protocol Implementation Model Based on Protocol Composition

A protocol implementation model with dynamically exlendible syntax is proposed based on protocol composition.The structure of protocol syntax is divided into four categories according to the existing protocol features,and correspondingly,four different dynamic ally extendible protocol syntax implementation models are proposed.The software implementation based on the model is flexible and extensible in syntax structure.Using this model the syntax structure can be extended without stopping protocol services.Taking SIP for example,this paper explains how to use this model to implement dynamic extension of protocol syntax based on VOCAL.