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Voice over IP Thực hiện: Nhóm 7 Cao Đức Quân Nguyễn Thị Thanh Quyên Nguyễn Văn Tài Trần Minh Tâm

Noäi dung ,[object Object],[object Object],[object Object]

Internet Protocol (IP) ,[object Object],[object Object],Header Checksum Flags Total length Data (Variable) Options (+Padding) Destination Address Source Address Protocol Time to live Fragment Offset Identification Type of Service IHL Version

Voice sang IP Analog Digital Voice CODEC: Analog sang Digital (PCM, ADPCM…) Nén Tạo Voice Datagram (phần dữ liệu trong gói IP) Gắn Header (RTP, UDP, IP, etc)

IP sang voice Digital Analog Voice Xử lý Header Re-sequence and Buffer Delay Giải nén CODEC: Digital sang Analog

Kiến trúc tổng quát ,[object Object],[object Object],[object Object],[object Object]

Các thành phần của mạng VoIP

Chất lượng dịch vụ (QoS) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

ITU-T H series ,[object Object],[object Object],[object Object],[object Object],[object Object]

Caùc ñònh nghóa ,[object Object],[object Object],[object Object]

H.323 Protocols Call Control Data Audio Video A/V Control H.26x RTP RAS RTCP UDP G.7xx H.245 T.120 TCP IP H.225 Q.931

Gateway ,[object Object],[object Object],[object Object]

Gatekeeper ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

H.225 RAS ,[object Object],[object Object],[object Object],[object Object]

H.245 ,[object Object],[object Object],[object Object],[object Object],[object Object]

Call Signaling ,[object Object]

H.323 Both Endpoints Registered, Same Gatekeeper - Gatekeeper Routed Call Signaling

ARQ(1) AFC/ARJ(2) Setup(3) Call processing (4) ARQ(5) AFC/ARJ(6) Alerting (7) Connect (8) RAS Messages Call signaling Messages Ghi chú:

Session Initiation Protocol (SIP) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Thoâng ñieäp SIP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Thoâng ñieäp phaûn hoài Global Failure 6xx Server Error 5xx Client Error 4xx Redirection 3xx ACK 2xx Informational 1xx

H oaït ñoäng cuûa SIP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Proxy Redirect Registrar Location SIP Servers UAC UAS UAC UAS Signaling messages between User Agent and Servers Ghi chú: ,[object Object],UAC: User Agent Client UAS: User Agent Server

Location server User Agent 1 User Agent 2 1. INVITE 7. 200 OK 8. ACK 4. INVITE 6. 200 OK 9. ACK 5. Ring Proxy Server

User Agent Registrar Server REGISTER 200 OK

Location server Redirect Server User Agent 1 1. INVITE 4. 302 Moved 5. ACK User Agent 2 7. Ring 6. INVITE 8. 200 OK 9. ACK

Media Gateway Control Protocol ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

MGCP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

MGCP ,[object Object],[object Object],[object Object],[object Object],[object Object]

Moät soá Protocol hoã trôï VoIP Multicast IP, RTP , RTCP , RSVP , RTSP, ENUM ,SDP ………..

Multicast IP ,[object Object],[object Object]

Real-Time Protocol ,[object Object],[object Object],[object Object],[object Object],[object Object]

Real-Time Transport Protocol (RTP) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Real-Time Transport Protocol(RTP) The RTP header format V=2 P X CC M PT Sequence Number Timestamp Synchronization Source (SSRC) identifier Contributing Source(CSRC) identifier ………… Defined by profile Length Header extension ……… 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 Bits RTP Header (fixed)I Inserted By Mixer (Optional) Header extension (Optional and Variable length)

Real-Time Transport Protocol(RTP) The RTP header format ,[object Object],[object Object],[object Object],[object Object]

Real-Time Transport Protocol(RTP) The RTP header format ,[object Object],[object Object],[object Object],[object Object],[object Object]

Real-Time Control Protocol (RTCP) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

RTCP Function ,[object Object],[object Object]

Ưu - Nhược điểm ,[object Object],[object Object],[object Object],[object Object],[object Object]

Ưu - Nhược điểm ,[object Object],[object Object]

Ưu - Nhược điểm ,[object Object],[object Object],Internet PSTN

Ưu - Nhược điểm ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Ưu - Nhược điểm ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Lợi ích ,[object Object],[object Object],[object Object]

VoIP trong tương lai ,[object Object],[object Object],[object Object]

Taøi lieäu tham khaûo ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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