網際網路電話網際網路電話 (VoIP)(VoIP)
2005/06/062005/06/06
威盛電子 威盛電子 GreenGreen
OutlineOutline
VoIP VoIP 簡介簡介 VoIP VoIP 之相關產品 之相關產品 VoIP VoIP 相關知識介紹相關知識介紹 VoIP VoIP 軟硬體的技術與設計軟硬體的技術與設計 VoIP VoIP 最新發展趨勢與未來展望最新發展趨勢與未來展望 VoIP VoIP 結論結論
VoIPVoIP 簡介 簡介 ( Voice over ( Voice over Internet Protocol )Internet Protocol )
Over Internet rather than PSTN Over Internet rather than PSTN (public swithed telephone network)(public swithed telephone network)
Operating ModelsOperating Models PC to PC/PhonePC to PC/Phone Phone to PC/PhonePhone to PC/Phone
VoIP ProtocolVoIP Protocol H.323 / SIP (Session Initiation Protocol)H.323 / SIP (Session Initiation Protocol) MGCP/MEGACO – Integrate with PSTNMGCP/MEGACO – Integrate with PSTN SIGTRAN – Transmit SS7 signal over IP.SIGTRAN – Transmit SS7 signal over IP.
Operating ModelsOperating Models
PC to Phone
PC
to P
C
Phone to
Phone
Phone to PC
POWERFAULT DATA ALARM IP Telephony GW
1 2 3
4 5 6
7 8 9
* 8 #
IP Phone
Internet
1 2 3
4 5 6
7 8 9
* 8 #
IP Phone
Telephone
Telephone
POWERFAULT DATA ALARM IP Telephony Gw
Over IPPSTN
VoIP ArchitectureVoIP Architecture
VoIPVoIP 之相關產品 之相關產品 [1/4][1/4]
IP Phone ( Skype )IP Phone ( Skype ) Video Conference - NetMeetingVideo Conference - NetMeeting Soft SwitchSoft Switch
將傳統交換機以軟體實現將傳統交換機以軟體實現 Location ServerLocation Server Media GatewayMedia Gateway
Interface between PSNT and InternetInterface between PSNT and Internet MCU (Multi-point Control Unit)MCU (Multi-point Control Unit)
負責處理多方通話負責處理多方通話
VoIPVoIP 之相關產品 之相關產品 [2/4][2/4]
VoIPVoIP 之相關產品 之相關產品 [3/4][3/4]
VoIPVoIP 之相關產品 之相關產品 [4/4][4/4]
VoIPVoIP 相關知識介紹相關知識介紹 -H.323 -H.323 [1/4][1/4]
The first standard provides audio, video and The first standard provides audio, video and data communications over IP-based data communications over IP-based network.network.
Recommanded by ITU in 1996.Recommanded by ITU in 1996. Logical ComponentLogical Component
Terminal : PhoneTerminal : Phone Gatekeeper : Addressing and Bandwidth controlGatekeeper : Addressing and Bandwidth control Gateway : Interface between PSTN and InternetGateway : Interface between PSTN and Internet MCU : Mutli-point control unitMCU : Mutli-point control unit
VoIPVoIP 相關知識介紹相關知識介紹 -H.323 -H.323 [2/4][2/4]
H.245 O
ver TC
PM
edia Over U
DP
H.323 Terminal
H.323 Terminal
TCP Connection
Setup
Alerting (Optional)
CONNECT (H.245 Address)
Q.931 O
ver TCP
GateKeeper
Admission Request
RA
S Channel
Over TC
P
Admission Confirm
ARQ
ACF
TCP Connection
Open Logical Channel
RTP Stream
RTCP Stream
RTP Stream
RTP & RTCP AddressExchange
VoIPVoIP 相關知識介紹相關知識介紹 -SIP -SIP [3/4][3/4]
Developed by IETF.Developed by IETF. Establish, Maintain and Close the Establish, Maintain and Close the
connection.connection. Logic UnitsLogic Units
User Agent – PhoneUser Agent – Phone Proxy Server – Proxy Server – 轉送請求轉送請求 Redirect Server – Location-query agentRedirect Server – Location-query agent Location Server – AddressingLocation Server – Addressing
VoIPVoIP 相關知識介紹相關知識介紹 -SIP -SIP [4/4][4/4]
Proxy Server
User Agent ClientCalling Party
User Agent ServerCalled Party
Redirect Server
Location Server
Proxy Server
Proxy Server
SIP Request
SIP Response
Media Stream
QueryQue
ry
Media Stream
H.323 vs SIPH.323 vs SIP
Complexity
Completeness Trend
VoIP VoIP 軟硬體的技術與設計軟硬體的技術與設計[1/3][1/3]
Internet
Hardware
網路傳輸層
RTP Protocol(Media Stream)
SIP/H.323(Session Control)
Application ( )應用程式
Hardware
網路傳輸層
RTP Protocol(Media Stream)
SIP/H.323(Session Control)
Application ( )應用程式
VoIP VoIP 軟硬體的技術與設計軟硬體的技術與設計[2/3][2/3]
SoftwareSoftware Audio Data ProcessingAudio Data Processing
CODEC – G.711, G.723CODEC – G.711, G.723 Mixing and Echo CancellationMixing and Echo Cancellation
Communication ProtocolCommunication Protocol Socket ProgrammingSocket Programming Header ProcessingHeader Processing Network Bandwith ControlNetwork Bandwith Control
Delay, Jitter and Packet LostDelay, Jitter and Packet Lost
ApplicationApplication Usage – Usage – 打電話、鈴聲、多方通話打電話、鈴聲、多方通話 UI design – Art DesignUI design – Art Design
VoIP VoIP 軟硬體的技術與設計軟硬體的技術與設計[3/3][3/3]
HarewareHareware Audio CODECAudio CODEC Processor - MotorolaProcessor - Motorola DSP - TI ChipDSP - TI Chip RAM - 8 / 16 MBytesRAM - 8 / 16 MBytes Flash - 2 / 4 MbytesFlash - 2 / 4 Mbytes
CostCost PerformancePerformance
System AnalysisSystem Analysis
Data TransportationData Transportation StorageStorage ThreadingThreading Event-DrivenEvent-Driven ComponentsComponents
ParserParser Session ManagerSession Manager
User InterfaceUser Interface Usage, Art DesignUsage, Art Design
Short BreakShort Break
趨勢與未來展望趨勢與未來展望 結論結論
VoIP VoIP 最新發展趨勢與未來展望最新發展趨勢與未來展望[1/2][1/2]
H.323 -> SIP (H.323 -> SIP ( 總成長總成長 42%, SIP42%, SIP 佔佔75%)75%)
Home GatewayHome Gateway ADSLADSL Cabel ModemCabel Modem IP PhoneIP Phone HubHub NATNAT Personal FirewallPersonal Firewall
VoIP VoIP 最新發展趨勢與未來展望最新發展趨勢與未來展望[2/2][2/2]
3G (3G ( 第三代行動通訊第三代行動通訊 )) All IP Network.All IP Network.
POE ( Power over Ethernet )POE ( Power over Ethernet ) Game ConsoleGame Console
Real time communicationReal time communication
結論結論 From SoftwareFrom Software
Network Programming – Socket and ProtocolNetwork Programming – Socket and Protocol Audio ProcessingAudio Processing User InterfaceUser Interface
From HarewareFrom Hareware CODEC acceleration, CPU and DSP CODEC acceleration, CPU and DSP
performance.performance. From FutureFrom Future
應用應用 ? ? 市場市場 ??