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Research and Implementation of the SIP Server in IPPBX

Author: BaoShangCe
Tutor: HangDeQuan
School: PLA Information Engineering University
Course: Software Engineering
Keywords: VoIP SIP protocol Proxy server Registration server Embedded systems
CLC: TN915.05
Type: Master's thesis
Year: 2009
Downloads: 47
Quote: 0
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Abstract


This issue through research based on SIP protocol the IP subscriber exchange ( IP PBX ) software implementation in the original carrier-class the exchange Product NGL04 underlying hardware platform , by increasing the SIP signaling gateway , media gateway , registration server , proxy servers and other hardware and software parts module is to develop a set of VoIP, data , real-time communication in an integrated media communication system . SIP-based VoIP system should be composed by the proxy server , registration server , media gateways , and several other parts . This paper describes the SIP-based VoIP system call flow , call stateful proxy server implementation , the implementation of the registration server reserved . SIP to the proxy server ( proxy server ) defines two modes of operation of the state and non- state . In stateless mode , the intermediate server receives a call request , perform the corresponding operation will request prequel , does not retain the call state . Call stateful proxy server reserved a call status information , you can achieve full control of the call , you can achieve some complex business logic to provide rich services . The papers detailed description of the finite state machine - based proxy server implementation . SIP user before the session is initiated , should first register server registers . The registration server the address information registered by the user will typically stored in a location server , such a proxy server or a redirect server to know which addresses can be reached . Registration information at any time to refresh ( the default period is one hour ) , should take the initiative to registered users from time to time . Registration services are generally accompanied by other functions, such as user authentication function . The paper describes a method with a user authentication function of the registration server . A huge amount of instant messaging message , in full proxy mode , instant messaging and its response should be forwarded through a proxy server to the proxy server enormous pressure , the paper presents embedded lightweight server instant messaging methods .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication network > General issues > Communication network equipment
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