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 ??