基于SIP的家庭网关呼叫管理状态机研究与实现  

RESEARCH AND IMPLEMENTATION OF SIP-BASED HOME GATEWAY CALL MANAGEMENT FSM

作　　者：冯健[1] 

机构地区：[1]西安科技大学计算机科学与技术学院,陕西西安710054

出　　处：《计算机应用与软件》2014年第3期108-111,共4页Computer Applications and Software

基　　金：陕西省教育厅科研计划项目(2010JK665)

摘　　要：实现高性能的VoIP(Voice over IP)业务是家庭网关研究的热点。会话初始化协议SIP(Session Initiation Protocol)是VoIP技术中被广泛采用的信令控制协议之一。简述SIP协议的基本概念,从消息类型、呼叫流程和媒体协商三方面研究协议的基本原理;对家庭网关上的语音软件进行模块划分,并说明各模块的功能;着重介绍呼叫管理状态机的设计与实现,包括终端状态机和SIP连接状态机的状态、事件、状态变迁及交互。其中终端状态机将模拟电话的硬件状态抽象为不同的逻辑状态,是创新点。经测试,SIP信令流程符合RFC3261标准,具有良好的互通性。相比一般的家庭网关,该语音网关性能达到电信级标准。It is a focus in home gateway research to realize high performance VoIP business. SIP is one of the widely used signaling control protocols in ~oIP technology. The article outlines the initial concepts of SIP protocol, and then studies the initial principles of the protocol from three angles-message types, call process and media consultation ; it divides the home gateway voice software into modules and elaborates the functions of each module ; it intentionally introduces the design and implementation of call management FSM, including terminal FSM and the status, events, status changes and interactions of SIP connection FSM. In the terminal FSM part, the article innovatively abstracts the hardware statuses of the analog phone into various logical statuses. Tests show that SIP signaling process conforms to RFC3261 standard and is well intercommunicative. Compared to ordinary home gateways, the proposed voice gateway performance meets carrier-grade standards.

关 键 词：家庭网关 会话初始化协议 呼叫管理 状态机 用户代理 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]