網際網路電話 (VoIP) 2005/06/06 威盛電子 Green

Outline VoIP 簡介 VoIP 簡介 VoIP 之相關產品 VoIP 之相關產品 VoIP 相關知識介紹 VoIP 相關知識介紹 VoIP 軟硬體的技術與設計 VoIP 軟硬體的技術與設計 VoIP 最新發展趨勢與未來展望 VoIP 最新發展趨勢與未來展望 VoIP 結論 VoIP 結論

VoIP 簡介 ( Voice over Internet Protocol ) Over Internet rather than PSTN (public swithed telephone network) Over Internet rather than PSTN (public swithed telephone network) Operating Models Operating Models PC to PC/Phone PC to PC/Phone Phone to PC/Phone Phone to PC/Phone VoIP Protocol VoIP Protocol H.323 / SIP (Session Initiation Protocol) H.323 / SIP (Session Initiation Protocol) MGCP/MEGACO – Integrate with PSTN MGCP/MEGACO – Integrate with PSTN SIGTRAN – Transmit SS7 signal over IP. SIGTRAN – Transmit SS7 signal over IP.

Operating Models PC to Phone PC to PC Phone to Phone Phone to PC

VoIP Architecture

VoIP 之相關產品 [1/4] IP Phone ( Skype ) IP Phone ( Skype ) Video Conference - NetMeeting Video Conference - NetMeeting Soft Switch Soft Switch 將傳統交換機以軟體實現 將傳統交換機以軟體實現 Location Server Location Server Media Gateway Media Gateway Interface between PSNT and Internet Interface 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

VoIP 之相關產品 [2/4]

VoIP 之相關產品 [3/4]

VoIP 之相關產品 [4/4]

VoIP 相關知識介紹 -H.323 [1/4] The first standard provides audio, video and data communications over IP-based network. The first standard provides audio, video and data communications over IP-based network. Recommanded by ITU in Recommanded by ITU in Logical Component Logical Component Terminal : Phone Terminal : Phone Gatekeeper : Addressing and Bandwidth control Gatekeeper : Addressing and Bandwidth control Gateway : Interface between PSTN and Internet Gateway : Interface between PSTN and Internet MCU : Mutli-point control unit MCU : Mutli-point control unit

VoIP 相關知識介紹 -H.323 [2/4]

VoIP 相關知識介紹 -SIP [3/4] Developed by IETF. Developed by IETF. Establish, Maintain and Close the connection. Establish, Maintain and Close the connection. Logic Units Logic Units User Agent – Phone User Agent – Phone Proxy Server – 轉送請求 Proxy Server – 轉送請求 Redirect Server – Location-query agent Redirect Server – Location-query agent Location Server – Addressing Location Server – Addressing

VoIP 相關知識介紹 -SIP [4/4]

H.323 vs SIP

VoIP 軟硬體的技術與設計 [1/3]

VoIP 軟硬體的技術與設計 [2/3] Software Software Audio Data Processing Audio Data Processing CODEC – G.711, G.723 CODEC – G.711, G.723 Mixing and Echo Cancellation Mixing and Echo Cancellation Communication Protocol Communication Protocol Socket Programming Socket Programming Header Processing Header Processing Network Bandwith Control Network Bandwith Control Delay, Jitter and Packet Lost Delay, Jitter and Packet Lost Application Application Usage – 打電話、鈴聲、多方通話 Usage – 打電話、鈴聲、多方通話 UI design – Art Design UI design – Art Design

VoIP 軟硬體的技術與設計 [3/3] Hareware Hareware Audio CODEC Audio CODEC Processor - Motorola Processor - Motorola DSP - TI Chip DSP - TI Chip RAM - 8 / 16 MBytes RAM - 8 / 16 MBytes Flash - 2 / 4 Mbytes Flash - 2 / 4 Mbytes Cost Cost Performance Performance

System Analysis Data Transportation Data Transportation Storage Storage Threading Threading Event-Driven Event-Driven Components Components Parser Parser Session Manager Session Manager User Interface User Interface Usage, Art Design Usage, Art Design

Short Break 趨勢與未來展望 趨勢與未來展望 結論 結論

VoIP 最新發展趨勢與未來展望 [1/2] H.323 -> SIP ( 總成長 42%, SIP 佔 75%) H.323 -> SIP ( 總成長 42%, SIP 佔 75%) Home Gateway Home Gateway ADSL ADSL Cabel Modem Cabel Modem IP Phone IP Phone Hub Hub NAT NAT Personal Firewall Personal Firewall

VoIP 最新發展趨勢與未來展望 [2/2] 3G ( 第三代行動通訊 ) 3G ( 第三代行動通訊 ) All IP Network. All IP Network. POE ( Power over Ethernet ) POE ( Power over Ethernet ) Game Console Game Console Real time communication Real time communication

結論 From Software From Software Network Programming – Socket and Protocol Network Programming – Socket and Protocol Audio Processing Audio Processing User Interface User Interface From Hareware From Hareware CODEC acceleration, CPU and DSP performance. CODEC acceleration, CPU and DSP performance. From Future From Future 應用 ? 市場 ? 應用 ? 市場 ?