voip 說明與介紹

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VoIP 說明與介紹. What Is VoIP?. Voice over Internet Protocol IP telephony 在 IP 的網路上提供的電話語音服務. How dose VoIP work?. 將類比的語音資訊以數位化的封包 (packge) 方式在網路上傳送 (PSTN) 類比訊號＝＞數位訊號 (VoIP). Analog→Digital. VOIP 如何運作. 1. 先利用 ADC 將類比聲音轉為數位訊號 2. 將數位訊號壓縮 , 以更好的格式傳送 3. 將聲音資料加入 RTP(real-time protocol) 之中 - PowerPoint PPT Presentation

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VoIP
What Is VoIP?Voice over Internet ProtocolIP telephonyIP
(packge) (PSTN)(VoIP)How dose VoIP work?
AnalogDigital
VOIP1.ADC2.,3.RTP(real-time protocol)4., ITU-T H.323 , IETF SIP5.,6.DAC

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VOIP
VOIPPSTN*

VOIP PSTN,PSTN64KRouterVoIPGatewayGatekeeper
VoIP (1)H.323 (Protocal V2 & Protocal V3)(2)SIP(Session Initiation Protocol, RFC-2543)(3)MGCP(MGCP(Media Gateway ControlProtocol,RFC-2705)(4)MEGACO/H.248Media Gateway ControllerCall Agent(RFC-3015)
VOIPH. 3231996 ITU-TSIP (Session Initiation Protocol )19993IETF (Internet Engineering Task Force) MGCP Media Gateway Control Protocol 199910IETFMEGACO/H.248200011ITU-TIETFRFC 3015*
H.323

1996(ITU)

(LAN)

H.3234

1.( Terminal )2.( Gateway )3.( Gatekeeper )4.( Multipoint Control UnitMCU )*
SIP1999IETFSIPH.323

SIPClient-Server [email protected] baud.com.tw marketingH.323 E.164H323 ID

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MGCPIETF199910MGCP

MGCP (Media Gateway Control Protocol) H.323SIP H.323SIPPeer-to-Peer ProtocolMGCP Master-slave ProtocolMGCP Server

RFC2705IETFMGCPMegacoITU-A2000MGCPIETFRFC2805*
MEGACO

ITUIETFMegaco/ H.248MegacoIntranetSIP*
SIP or H.323*

SIP H.3232000/111995H.323Server/ClientQoS300~500
VoIPVoIPPC-to-PCPC-to-PhonePhone-to-Phone
PC-to-PC ServerServerPC-to-PCSkype
PC-to-PhoneServerPC-to-PC
Phone-to-PhoneVoIP Gateway
1995 Toll bypass 1996 ITU H.323 1999 IETF SIP SIPVoIP 2003 Skype P2P Yahoo BB VoIP2006 1VOIP 050 Skype P2P VoIP 1.77
2003 050 2004 070 2005 3 VoIP services6 PSTN# VoIP Free TelecomCegetelTiscali France2003 2004 VoIP 2010 VoIP32.6 40% VoIP 17% VoIP (Jun Jupiter Research)
VoIP 2001 ISP 2004 Skype PCHome Skype-out 450 ISP eNUM, IPOXSARS 2005 DGT (NCC) E.164 VoIP
E.164E.164 886-2-87883728 E.164 E.164 070 11 E.164 CCC-AAA-OOOO-LLLL CCC (country code) 188686 AAA (area code) 247OOOO (office code) 25218226 LLLL (local number)
PC to PCVoIP PC VoIP SkypeMSN Messenger PC to PhonePC VoIPSkype Phone to PhoneVoIP ISP
Skypehttp://netcenter.ncnu.edu.tw/~gotop/skype.html
(IPv4/IPv6) (echo)TANet 8 : 99999999TANet 9 : 999999999 (IPv4)99191000(IPv6)99192100,99192101
**ITU-T1996( LAN )2000 H.323( G.711G.729G.723.1 )( H.261H.263 )( H.225 )( H.245 )(Registeration Admission Status RAS ) H.323 4 ( Terminal ) ( Gateway )( Gatekeeper ) ( Multipoint Control UnitMCU )VoIPH.323 IETF(Internet Engineering Task Force)19998MGCP (Media Gateway Control Protocol) 19993 SIP (Session Initiation Protocol) H.323

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