信令技術(shù)保證電話呼叫的順利實現(xiàn)和話音質(zhì)量

1、Report for Case 5VoIP Will Bring “Dramatic Transformation”Liang Qinyan, Li Yang, Zhou Xuhui, Lin GuoqiangGroup 2MIS-B XiAn2004-5-22AgendanWhat Is VoIP?nVoIP Communication ModelnChanging the Communication and Business WaynVoIP RegulationnAdvantage and Need ImprovednCurrent status in PRCnDevelopment t

2、rendWhat Is VoIP?信令技術(shù)保證電話呼叫的順利實現(xiàn)和話音質(zhì)量,目前被廣泛接受的VoIP控制信令體系包括ITUT的H.323系列和IETF的會話初始化協(xié)議SIP。 VoIP中網(wǎng)絡(luò)傳輸技術(shù)主要是TCP和UDP,此外還包括網(wǎng)關(guān)互聯(lián)技術(shù)、路由選擇技術(shù)、網(wǎng)絡(luò)管理技術(shù)以及安全認證和計費技術(shù)等。 網(wǎng)關(guān)由公用電話網(wǎng)PSTN中繼接口、數(shù)字信號處理板DSP、主處理器、全局RAM、以及以太網(wǎng)卡等設(shè)備組成。 VoIP Communication ModelISPISPFixed phonenetworkMobile phoneNetworkPCIP networkPhone to PhonePhone

3、to PCPC to PCPC to PhoneFixed phonenetworkMobile phoneNetworkPCChanging the Communication and Business WaynVoice emailHear anytime, can forward it to another personnVirtual phone number- One virtual phone number instead of many phone number with different area codes- Ring desktop, laptop or forward

4、to where you trip tonSpeaker phone over VoIP - Conference - E-learningVoIP RegulationnLaw enforcement assistancenTechnology standardnManaging securitynControl the usingVoIP Regulation will affect VoIp developmentAdvantage andNeed ImprovednAdvantagenReduce cost (通過Internet打長途電話的成本僅相當(dāng)于傳統(tǒng)電話的1/5,最多不到5O%

5、)nMobilitynNew capabilities being addednNeed ImprovednQuality problemnManagement problemCurrent status in PRC從這個數(shù)據(jù)，我們可以看到從今年1月起，IP通信的業(yè)務(wù)量每月的同比增長都是在55.2%左右，而且，這個數(shù)字仍然在穩(wěn)步增加。IP電話作為下一代電話而倍受矚目的原因，是其與通信業(yè)務(wù)經(jīng)營者所傳輸?shù)恼Z音量和IP信息量比率有關(guān)。 Development trendnCombine VoIP with wireless technology (WiFi)nMore service funcatons will be developed人們已在越來越多地討論“三網(wǎng)合一”，即電信網(wǎng)、有線電視網(wǎng)和計算