本文關(guān)鍵詞： 會(huì)話初始協(xié)議 PJSIP NAT穿越 信令　出處：《華南理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著互聯(lián)網(wǎng)的快速發(fā)展和迅速普及，用戶對(duì)網(wǎng)絡(luò)通信服務(wù)的需求也日益提高。在這些網(wǎng)絡(luò)通服務(wù)器中多媒體應(yīng)用逐漸占據(jù)著主導(dǎo)作用，其中以物聯(lián)網(wǎng)語(yǔ)音協(xié)議(Voice overInternet Protocol,VoIP)技術(shù)最為突出，VoIP是一種以IP電話為主，，在互聯(lián)網(wǎng)上進(jìn)行語(yǔ)音傳輸，并推出相應(yīng)的增值業(yè)務(wù)的技術(shù)，它最大的優(yōu)勢(shì)在于能廣泛地采用Internet和全球IP互聯(lián)的環(huán)境，提供比傳統(tǒng)業(yè)務(wù)更多、更好的服務(wù)。 會(huì)話初始協(xié)議(Session Initiation Protocol,SIP)作為VoIP技術(shù)中最重要的信令協(xié)議之一，是IETF定義的應(yīng)用層控制協(xié)議，用來(lái)建立、修改和終止兩個(gè)或多個(gè)參與者之間的多媒體會(huì)話。SIP憑借其簡(jiǎn)單、開(kāi)放、靈活、可擴(kuò)展等諸多優(yōu)點(diǎn)，已經(jīng)成為多媒體通信的研究熱點(diǎn)，并且已經(jīng)被第三代合作伙伴計(jì)劃(3rd Generation Partnership Project,3GPP)采納為移動(dòng)網(wǎng)絡(luò)的應(yīng)用協(xié)議，成為下一代網(wǎng)絡(luò)技術(shù)中的關(guān)鍵技術(shù)之一。 本文根據(jù)RFC3261對(duì)SIP協(xié)議及其相關(guān)擴(kuò)展協(xié)議進(jìn)行深入的研究與分析，同時(shí)對(duì)所選擇的PJSIP開(kāi)源項(xiàng)目進(jìn)行了簡(jiǎn)要的介紹，并介紹了PJSIP中幾種重要模塊。在理解RFC和PJSIP的基礎(chǔ)上，本文提出了改善會(huì)話建立時(shí)間以及通話穩(wěn)定性的方案，并給出了可行性分析和測(cè)試結(jié)果。 本文基于PJSIP協(xié)議棧實(shí)現(xiàn)了Windows平臺(tái)下的音視頻通信系統(tǒng)，其功能包括SIP賬號(hào)注冊(cè)、音視頻通信、狀態(tài)呈現(xiàn)、好友分類管理等。程序主界面顯示好友列表，通過(guò)選擇列表中的好友進(jìn)行刪除、分類管理以及進(jìn)行呼叫通話的操作，還可通過(guò)搜索功能添加好友。此外，本系統(tǒng)還設(shè)計(jì)了SIP信令P2P的功能，能在NAT穿越的基礎(chǔ)上，將SIP信令直接發(fā)送到對(duì)方終端上，而不經(jīng)過(guò)服務(wù)器轉(zhuǎn)發(fā)，可減少服務(wù)器的負(fù)擔(dān)以及降低了因服務(wù)器轉(zhuǎn)發(fā)報(bào)文引起的網(wǎng)絡(luò)延遲。 通過(guò)在Windows XP和Windows7操作系統(tǒng)下的測(cè)試表明，SIP通信系統(tǒng)的各項(xiàng)功能運(yùn)行穩(wěn)定，對(duì)PJSIP修改的部分也達(dá)到了預(yù)期的效果。系統(tǒng)還具有良好的可擴(kuò)展性，后期可以在此基礎(chǔ)上進(jìn)行更多的功能實(shí)現(xiàn)。
[Abstract]:With the rapid development and popularity of the Internet, users' demand for network communication services is also increasing. Multimedia applications are gradually playing a leading role in these network communication servers. VoIP is one of the most prominent VoIP technologies based on VoIP, which is the Internet of things Voice Protocol (VoIP) protocol. Voice transmission over the Internet, and the introduction of corresponding value-added services technology, its biggest advantage is that it can widely use Internet and global IP interconnection environment, provide more than traditional services. Better service. Session Initiation Protocol (SIP) is one of the most important signaling protocols in VoIP technology. Sip is an application-layer control protocol defined by IETF, which is used to establish, modify and terminate multimedia sessions between two or more participants. Sip has many advantages such as simple, open, flexible, extensible and so on. Has become the research hotspot of multimedia communication, and has been the 3rd Generation Partnership Project by the 3rd generation partner plan. 3GPP) is adopted as the application protocol of mobile network and becomes one of the key technologies in the next generation network technology. According to RFC3261, this paper makes a deep research and analysis on SIP protocol and its related extension protocols, and briefly introduces the PJSIP open source project. Several important modules in PJSIP are introduced. Based on the understanding of RFC and PJSIP, this paper puts forward a scheme to improve the session establishment time and call stability. The feasibility analysis and test results are given. Based on PJSIP protocol stack, this paper implements the audio and video communication system based on Windows platform. Its functions include SIP account registration, audio and video communication, and status rendering. Friends classification management. The main interface shows the list of friends, through the selection of friends in the list to delete, classification management and call call operations, but also through the search function to add friends. In addition. The system also designed the SIP signaling P2P function, on the basis of NAT traversing, the SIP signaling can be sent directly to the other terminal without forwarding through the server. It can reduce the burden on the server and reduce the network delay caused by the server forwarding messages. The tests under Windows XP and Windows7 operating system show that the functions of Windows communication system are stable. The system also has good expansibility and can be implemented on this basis.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN916.5

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本文編號(hào)：1442252