IP Telephony の現状と今後の展望 - 国際大学グローバ Telephony は、通信コストの削減、インターネットやデータ通信との親和性 の高さといった長所がある一方で、操作性、品質、相互接続性などの点で従来の 電話に劣る面もある。また、あくまで電話であることからくるユニバーサル

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  • GLOCOM Review 3:7/8 Center for Global Communications, 1998

    IP Telephony

    1.IP Telephony 2.IP Telephony 3.IP Telephony 4. IP Telephony 5.IP Telephony 6.IP Telephony 7.IP Telephony

    IP TelephonyIP IP IP VoIPVoice over IP

    IP Telephony

    IP TelephonyIP Telephony

    IP TelephonyIPTelephonyIP Telephony

  • GLOCOM Review 3:7/8

    2

    1

    1997 1

    IPInternet Protocol2

    IP

    IP Telephony Fax

    IP Fax IPTelephony

    1.IP Telephony

    1.1IP Telephony

    IP TelephonyIP Telephony 1995 2 VocalTec3Internet Phone IP Telephony 3 IP Telephony1996 7 Intel4Intel Internet Phone Microsoft5Netscape6 IP TelephonyNetscape NetscapeNavigator CoolTalk Microsoft NetMeeting IP Telephony 1996 8 IDT7Net2Phone

    1 15,000 1996 VocalTec Dialogic8Internet Telephony GatewayServerPSTN

    IP Telephony

    1 ActivMedia 1996 25 1997 218 1 8.7 2 Voice 1998 6 3 .4 .5 .6 .7 .8 .

  • GLOCOM Review 3:7/8

    3

    IP QoSQualityof Service

    1.2IP Telephony

    IP Telephony IPTelephony

    Fax IP IP

    Frost & Sullivan9IP Telephony 5 Khanna and Repentigny1997a

    Voicemail filewav

    Fax

    Voice Telephony

    Desktop Videoconferencing

    Application Sharing and Document Sharing

    Document Sharing

    1.3IP Telephony

    IP Telephony 3 1

    1. PCPC 2. PC3.

    1.PCPC PC PC

    PC

    9 .

  • GLOCOM Review 3:7/8

    4

    VocalTec Internet PhoneIntel Internet Video PhoneMicrosoft NetMeetingNetscape Netscape CoolTalk/Conference

    2.PC1.IP PC IDTNet2PhonePC IDT IDT IDT 800 ISP

    IDT PC

    ID PINPersonal Identification Number

    CTIComputer Telephony Integration1998

    3.IP

    PC ID PIN PC IP Telephony ITSPInternet Telephony ServiceProvider ITSP ISP

    FreePort i SP-10010IC FAX320011 Fax Casio PhoneMate IT-38012

    10 .11 .12 .

    1

  • GLOCOM Review 3:7/8

    5

    1.4 Fax

    Fax IP TelephonyFax Fax ISP UUNET TechnologiesUUNET13 1997 7 Fax UUFAX14Fax1 65KB 30 1516PSTN Fax 1997 4,400 2000 56 Fax 2000 Fax 74 40 2 Fax ITSP Fax

    ITSP FaxFax Fax Fax DDI17 LCR -LCR-ALPHA5 Fax DDI Fax -ALPHA5Fax Fax FaxFax Fax FaxFax PCFax PC 18F@xEm@il19PCFax Fax Fax NTT20

    F 21FaxPC Fax TIFF MIME SMTP PC Fax

    Fax Fax Fax 22IETFInternet Engineering TaskForce231998 6 ITU T.37

    2.IP Telephony

    2.1IP Telephony Pros

    13 .14 .15 .16 .17 .18 .19 .20 .21 .22 .23 .

  • GLOCOM Review 3:7/8

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    2.1.1

    IP TelephonyIP Telephony IP AP AP24 AP IP ISP IP

    flat-rateusage-based1 IP Telephony

    LAN IP

    ITSP 1 6877 2023

    3 3NTT 90* KDD 450*DDI, JT, TWJ 90* ITJJT, IDC 440*TTNet 63 Kallback 146**** 61** 91**AT&T@phoneAT&T Jens 69*** AT&T@phoneAT&T Jens 99***

    1 1998 5 27 * ** 10 3 *** **** 1.08 1 135

    25

    2 17 29261997

    1160 1KDD 410** 1 236 0.58**** 69 0.17***

    21997 1-1p.101

    * ** 1998 5 KDD 440 *** KDD 410 0.540.16

    IP Telephony Geoequipos

    24 25 .26 1 1996 160

  • GLOCOM Review 3:7/8

    7

    Geoequipos Telecom Peru IDDInternational Direct Dialing 1,800Telecom PeruVocalTecInternet Phone 150200 1/10 Cukier1998

    2.1.2

    IP

    Fax IP VoIP:Voice over IP IP

    TDMTime Division Multiplexer 10 TDM 1

    IP IP IP TDM IP IP TDM 27

    2.1.3

    IP Telephony IP LAN

    ConvergenceIP Telephony

    CTI CTI Call Center1998 30 2001 112 Gartner Group 2000 35Fax28Web-Enabled Call CenterWECCWECC eFusion29 eBridgeCall Center 1

    Push-To-Talk 27VoIP ATM VToAVoice trafficover ATM VoFRVoice over Frame Relay28 Essl Technologies. The Web-Enabled Call Center: Reaching Out to the Online Community..29 .

  • GLOCOM Review 3:7/8

    8

    1/10 deJong1998

    WECC Essl Technologies Managing Director Steven Dresner Internet

    Telephony TCP/IP Multimedia TelephonyDresner1997IP Telephony

    2.2IP Telephony Cons

    2.2.1

    IP Telephony

    ID PIN

    ID PIN 3

    2.2.2

    IP Telephony200250

    IP

    3 IP Telephony VoIP PC IP

    IP

    TCPTranmission Control Protocol30TCP TCP

    IP

    2.2.3Interoperability

    IP TelephonyIP Telephony

    30 IP-Telephony TCP UDPUser Datagram ProtocolUDP TCP QoS

  • GLOCOM Review 3:7/8

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    IP Telephony ITSP

    IP Telephony

    3.IP Telephony

    3.1IP Telephony

    3.1.1

    IP Telephony PC PCPC PCIP Telephony PC 1997 45 PC 311998 5 10 1997 28.8 1/41998

    1998 1 PC 4832[51] 10 1997 6.41 1996 3.31 2 2005 41.82010 54.91998 3 IAJ331998 23 7.08 1,009 7,300 1 9.5 23.4

    2.3 27.6 IP Telephony34

    1997 2005 2010 1,155 4,136 4,459

    287 6.4

    1,929 41.8

    2,755 54.9

    31998 1-1-9

    3.1.2

    35

    31 Computer Intelligence 1998/3.32 ZD Market Intelligence 1998/5. Computer Intelligence 1998 4 ZD Market Intelligence Ziff-Davis 33 .34 Internet Watch. .35

  • GLOCOM Review 3:7/8

    10

    1996 10 31

    36

    37

    1997 7 8 38

    1997 12 8 8 26 39

    3.1.3 IP Telephony

    PC IP Telephony 1995 2 VocalTec InternetPhone

    Pulver IP Telephony 4 VocalTec Internet Phone Microsoft NetMeeting 2

    1997 1996

    1 VocalTec Internet Phone (757) 1 VocalTec Internet Phone (1176)2 NetMeeting (414) 3 TeleVox (316)3 CU-SeeMe (305) 5 NetMeeting (314)4 TeleVox (276) 2 Intel Internet Video Phone (216)5 CoolTalk (249) 6 CU-SeeMe (202)6 Intel Internet Video Phone (231) 4 CoolTalk (173)7 Net2Phone (228) 10 WebPhone (169)8 FreeTel (160) 8 FreeTel (135)9 Freephone (155) NA VDOPhone (111)10 WebPhone (154) 7 Net2Phone (107)

    4IP Telephony1996, 1997 40

    IP Telephony IP Telephony1998 3 41 1 Lucent TechnologiesLucent

    42Alcatel43Northern Telecom44Ericsson45Siemens Telecom Networks46NEC47 36

    37 8/26 :38 .39 .40 Voice on the Net CoalitionVON 1 5 2 3 3 1 41 Computer Intelligence 1998/3.42 .

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    48 VoIP 2Cisco Systems493Com50AscendCommunications51Bay Networks52 VoIP 3 IP Telephony

    Act Networks53Clarent54Inter-Tel55Hypercom56Mockingbird57NetSpeak58Vienna Systems59VocalTec VoIP NetSpeak MCI Communications60 IP Telephony

    3.1.4IP Telephony

    IP TelephonyIP Telephony

    IP Telephony IP TelephonyPulver.com IP Telephony Voice on the Net CoalitionVON61 IP Telephony1996 9 26 240 IP TelephonyTalking NetVoice on the NetVON 2

    International Data GroupIDG62

    Vortex9863 1998 5 Com CiscoLucentMCI Vortex Advisory Board 200

    3.1.5 IP

    IP Telephony 1,2 WDMWavelength Division Multiplexing DWDMDense Wavelength Division Multiplexing IP IP Telephony 43 .44 .45 .46 .47 .48 .49 .50 .51 .52 .53 .54 .55 .56 .57 .58 .59 .60 .61 .62 .63 .

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    Qwest CommunicationsInternationalQwest641998 3 LCI InternationalLCI65 4 Qwest 1999 16,000 125 48 96 10 Qwest AT&T66MCI WorldCom67Sprint683

    Level3 CommunicationsLevel369WilliamsCommunicationsWilliams70 2000

    Level3 IP IP IP TelephonyQoS RSVP RSVP

    IP Qwest 13 ISP EUnet71 IP IP ISP IP IP Telephony

    3.1.6IPv6

    IPv6 IP IPv6 128 1 1,00072 32 IPv4 IP

    IP IP IP IPv6 IP IP IP IPv6

    3.2IP Telephony

    3.2.1

    IP Telephony

    64 .65 .66 .67 WorldCom: .68 .69 .70 .71 .72 1 1 1

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    1 0.020.08 0.040.16

    ITSP 1 5 IDT 1 1 1 5

    ITSP ISP 73

    IP

    1996 3 ACTAAmerica's Carriers Telecommunication AssociationITSP FCCFederal Communications Commission74 FCC 7ISP ITSP 1998 4 FCC ITSP IP Telephony Pulver.com75VocalTecIDTITXCInternet Telephony eXchange Carrier76

    FCC Pulver.com

    FCC 23 IP TelephonyPulver1998

    EUEuropean Union77PCPC PC EU EU 1998 1 EU

    2000 1 1 EU1998Reuters1998

    3.2.2

    ISP

    1 73 FCC Enhansed Servide Provider74 .75 .76 .77 .

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    4050 ISP 19.95

    ISP

    1998 ISP IBM78 19.95 100 19.95 100 1.95AT&T WorldNet 150 19.95 100 99

    ISP UUNET

    PC

    4. IP Telephony

    IP Telephony IP Telephony

    4.1

    IP Telephony 4

    ISP IP Telephony IP ITSP

    4.1.1ISP

    ISP 1997 ISP IP Telephony TeleportCommunications GroupTCG79 ISP CERFnet 1997TCG CERFnet80 1998 3 CERFtone1

    TCG 1998 AT&T ICG Communications811998 1

    ISP Netcom82 1998 166 IP TelephonyFax VPN

    78 .79 .80 .81 .82 .

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    ICG 5.9 7.2 2

    ISP M&A

    4.1.2 IP Telephony

    ITSP IP TelephonyTier1 ISP 10 IP Telephony

    AT&T 1998 5 AT&T Connect'N Save83

    7.5 8 8.5 2550100 3 1 45 AT&T One Rate International Plan50 MCI US West84 IP TelephonyWard1998

    4.1.3 IP

    Qwest 1998 2 Q. Talk IP IP TelephonyQ. Talk 1 7.5

    6 1998 25 1999 125

    IP Level3 Williams IP IP TelephonyLevel3 IP Telephony IP Williams 11,000 2001 27 32,000 IP IP Telephony

    4.1.4 ITSP

    ITSP 185 ITSP

    IDT

    83 .84 .85 500 IDT 270

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    DC 50 5 800 86 13

    71 20 32 49 27 65

    87 IDT

    IDT 1998 5 IDT IP TelephonyNet2Phone IBM 88 IBM Net2Phone 8 IDT 75 IBM Net2Phone

    Delta389800 20

    81 35 19 30 48 69

    IDT 90 Delta3 RSL Communications91 250 Delta3 RSL Communications

    IP Telephony

    Delta3 1998 5 1998 14 40 Delta3 Internet Phone Lite92 240 PC

    ITXC AT&T WorldNet 1997 7 ITSP ITXC ITSP

    1998 4

    86 NTT 87 88 .89 .90 Delta3 Delta391 .92 Internet Phone Lite

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    WWeXchange ITSP ITXC

    ITSPWWeXchangeITSP Network ofIP Telephony Networks Delta3 VIP Calling93 15 WWeXchange

    ITXC 1998 5 Intel VocalTec Chase Capital Partners94 1,000 95

    4.2

    1997 8 ISP ISP IPTelephony

    ISPITSP

    3

    4.2.1ISPITSP

    ISP 1997 8

    90 3 10 1997 5 6 Global Exchange CarrierGXC96 23GXC IP Telephony Vienna Systems ISP IP Telephony

    AT&T ISP AT&T Jens971997 8 IP TelephonyAT&T@phone98 99 3 AT&T Jens AT&T@phone AT&T 1998 5

    99100

    PC 1997 10 27.0 IDT IDT PC Net2Phone

    93 .94 .95 .96 .97 .98 .99 .100 .

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    4.2.2

    ISP 101

    1998 5 26 Nifty Serve 168 Nifty Serve 3,000

    Nifty Serve RSLRSL Communications IP Telephony

    IP TelephonyNTT 1997 6

    NTT NTT NTT NTT 1021998 4 ITSP IPTelephony Inter-Tel IP Glocalnet103 Telbatelecomunicacoes104 IP Telephony

    NTT NTT 105 ARCSTARIP Fax IP-VPN

    KDD KDD KCOM106KCOM 1998 4 KCOM 1997 7 9 Fax 3 450 KCOM 3 90 500KDD 1/5 KDD NTT ITXC

    6 1998 4 KDD KDD 107OK 180 3 *8131

    101 .102 .103 .104 .105 .106 .107 .

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    1998

    4.2.3

    IP TelephonyNEC 108 VoIP 109 PBXE-3200 ISS110 IP Telephony

    111 1997 IP Telephony BusinessWorksVoIP Internet Telephony ServerCTI Internet Call CenterWWW Fax INTUITY AUDIXMultimedia Messaging System 3 IP Telephony

    IP Telephony VocalTec 1998 3 112113 2

    114 1998 4 FRAD Frame RelayAssembly/Disassembly6560MPR PROVANGUARD 320 VoIP Voice over Frame RelayVoFR VoIP VoIP VoFR VoFR VoIP

    PBX PBX T1 1.5Mbps TTC 2Mbps NEC T1 PBX TTC

    4.3

    EU 1998 1 IP Telephony

    1151997 8 VocalTec 21.1

    1161998 4 T-NetCall

    108 .109 .110 .111 .112 .113 .114 .115 .116 .

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    117

    20 118

    19 99 FT1191998 3

    IP Telephony FT

    FT IP Telephony FT 3 IP Telephony FT

    Cukier1998 France Telecom InteractiveFTI120eFusion121

    eStream FT Wanadoo IP TelephonyFT IP Telephony

    1998 6 IP TelephonyVoice onthe NetVONEurope '981226 8 11 3 IP Telephony IP Telephony

    IP Telephony

    4.4

    IP Telephony

    Khanna and Repentigny1997b

    4.4.1

    ISP iNET1231998 3 IP Telephony 4555

    390 0.25 450 580

    117 .118

    20 119 .120 .121 .122 .123 .

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    720 850

    1998 124 IP Telephony Samsung Electronics125 Sungmi Telecom Electronics126Korea Telecom127

    4.4.2

    1997 Computer Protocol128Fax DSPDigital Signal ProcessorCpIP Voice GatewayCpIP Voice Gateway FCCEU

    4.4.3

    Lucent PT. Telkomunikasi IndonesiaPT.Telkom129PT Telekom 9,000 IP Telephony PT.Indonesia Satellite CorporationPT. Indosat1301997 4 Global Link131IP Telephony132

    4.4.4

    ISP OzEmail133OzEmail Phone13415 1.25 5.50 25

    4.4.5

    Telecom New ZealandTNZ135 1996 VocalTec IP Telephony1997 1 31 1361998 5

    4.4.6

    124 125 .126 .127 .128 .129 .130 .131 .132 .133 .134 .135 .136 .

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    Taiwan Telecommunications Network ServiceTTN137

    IP Telephony VocalTec

    5.IP Telephony

    IP Telephony

    IP TelephonyFax

    IP TelephonyIP Telephony

    PCPC PC IPTelephony

    5.1

    AT&T Jens AT&T@phone ID PIN

    NTT ID 1 AT&TJens ID 138NTT 7 139Fax 1 Fax Fax NTT WebDeFax140 InfoImaging Technologies141142

    Aplio143Aplio/Phone IP Telephony 1997 11 ISP 1 199 2

    137 .138AT&T@phone 186139.140 WWW FAX 141 .142 FAX

    143

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    379 Dunn19981998 H.323 H.323 InnoMedia144

    1997 11 InfoTalk ISP IP Telephony1 279.95 Aplio/Phone ISP

    5.2

    IP Telephony IP

    QoS

    5.2.1QoS

    QoS IP

    QoS RSVPresource ReSerVation Protocol RSVP Packeteer...

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