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Basic VOIP
- 1. Voice Over Internet Protocol SV th?c hi?n: Tr?n Minh H¨°a 1071090 D??ng V?n H?ng 1071093 Ph?m ?o¨¤n An Kh??ng 1071099 B¨´i Thanh T?nh 1071143 GV h??ng d?n: TS. L??ng Vinh Qu?c Danh
- 2. K? ho?ch th?c hi?n ?? t¨¤i T?ng quan VoIP Xem x¨¦t c¨¢c y?u t? c?u th¨¤nh VoIP ??nh tuy?n cu?c g?i qua c?ng Analog Voice Th?c hi?n ph¨¢t t¨ªn hi?u tho?i qua c?ng Digital Voice Kh?o s¨¢t VoIP Gateways v¨¤ Gateway Control Protocols
- 3. K? ho?ch th?c hi?n ?? t¨¤i X¨¢c ??nh c¨¢c ??c t¨ªnh c?a Dial Plan C?u h¨¬nh n?ng cao Dial Plan C?u h¨¬nh H.323 Gatekeeper Thi?t l?p h? th?ng VoIP th?c t?
- 4. Bu?i 1 T?ng quan VoIP Gi?i thi?u VoIP C¨¢c k? thu?t chuy?n m?ch C¨¢c m? h¨¬nh k?t n?i qua m?ng VoIP C¨¢c th¨¤nh ph?n c?u th¨¤nh m?ng VoIP C¨¢c giao th?c m?ng C¨¢ch th?c ho?t ??ng Nh?n t? ?nh h??ng ?u Nh??c ?i?m ?ng d?ng
- 5. Gi?i thi?u VoIP M?ng ?i?n tho?i truy?n th?ng PSTN (tho?i) v¨¤ m?ng Internet (data) t¨¢ch bi?t nhau
- 6. Gi?i thi?u VoIP Voice v¨¤ Data s? ???c truy?n t?i tr¨ºn IP qua c¨´ng 1 m?ng
- 7. Chuy?n m?ch k¨ºnh K¨ºnh d¨¤nh ri¨ºng cho 2 thi?t b? ??u cu?i T?c ?? truy?n d?n lu?n c? ??nh ?? tr? nh?
- 8. Chuy?n m?ch g¨®i D? li?u ???c chia nh? ra th¨¤nh c¨¢c g¨®i M?i g¨®i s? ???c chuy?n ri¨ºng r? ??n n?i nh?n s? ???c h?p l?i th¨¤nh d? li?u ban ??u
- 9. C¨¢c m? h¨¬nh k?t n?i VoIP PC to PC via the Internet Internet
- 10. C¨¢c m? h¨¬nh k?t n?i VoIP PC to Phone Internet GATEWAY PSTN
- 11. C¨¢c m? h¨¬nh k?t n?i VoIP Phone to Phone via the Internet Internet GATEWAY GATEWAY PSTN PSTN
- 12. C¨¢c m? h¨¬nh k?t n?i VoIP Using VoIP with your Cell Phone Cell Phone to PC via Internet Cell Phone to Cell Phone via 3G Internet PC to Cell Phone
- 13. Components of a VoIP Network
- 14. VoIP Protocols VoIP Signaling Protocols: control and call-signaling protocol Media Transmission Protocols:
- 15. VoIP Signaling Protocols H.323 MGCP: Media Gateway Control Protocol SIP: Session Initiation Protocol SCCP: Skinny Client Control Protoco
- 16. H.323 D efined by the International Telecommunication Union (ITU) for multimedia conferences over LANs A standard that specifies the components, protocols, and procedures that provide multimedia communication services, real-time audio, video, and data communications over packet networks, including IP networks.
- 17. H.323
- 18. MGCP MGCP is a client/server call control protocol built on a centralized control architecture MGCP is a plain-text protocol used by call-control devices to manage IP telephony gate-ways
- 20. SIP SIP is a peer-to-peer protocol where user agents (UAs) initiate sessions, similar to H.323. SIP is a protocol developed by the Internet Engineering Task Force (IETF) Multiparty Multimedia Session Control (MMUSIC) Working Group as an alternative to H.323
- 21. SIP SIP is a common standard based on the logic of the World Wide Web and is very simple to implement, it is widely used with gateways and proxy servers within service provider networks for internal and end-customer signaling.
- 22. SIP
- 23. SCCP is a client-server protocol SCCP is a Cisco proprietary protocol that is used for the communication between Cisco UCM and terminal endpoints
- 24. SCCP
- 25. Media Transmission Protocols Real-Time Transport Protocol RTP Control Protocol Secure RTP
- 27. Real-Time Transport Protocol Defined a standardized packet format for delivering audio and video over the Internet. Developed by the Audio-Video Transport Working Group of the IETF Provide end-to-end network transport functions intended for applications with real-time transmission requirements, such as audio and video, include payload-type identification, sequence numbering, time stamping, and delivery monitoring
- 28. RTP Control Protocol RTP provides out-of-band control information for an RTP flow used for QoS reporting provides a mechanism for hosts involved in an RTP session to exchange information about monitoring and controlling the session
- 29. Secure RTP
- 30. Secure RTP Published by IETF Designed to provide encryption, message authentication, and integrity, and replay protection to RTP data in both unicast and multicast applications.
- 31. C¨¢ch th?c ho?t ??ng S? h¨®a t¨ªn hi?u Analog L?y m?u (Sampling) L??ng t? h¨®a (Quantization) M? h¨®a (Encoding) N¨¦n gi?ng n¨®i (Voice Compression) T?o Voice Datagram: ?¨®ng g¨®i d? li?u G?n Header theo c¨¢c chu?n: RTP, UDP, IP,¡ Chuy?n c¨¢c g¨®i tin ??n IP nh?n th?ng qua Network
- 32. C¨¢ch th?c ho?t ??ng IP nh?n nh?n c¨¢c g¨®i tin X? l? c¨¢c g¨®i tin Gi?i n¨¦n c¨¢c g¨®i tin CODEC t¨ªn hi?u Digital th¨¤nh Analog
- 34. L??ng t? h¨®a (Quantization)
- 35. N¨¦n gi?ng n¨®i (Voice Compression)
- 36. Nh?n t? ?nh h??ng Factors influence : Echo: amplitude and delay Jitter: individual packets, contention, or congestion Delay: distance, coding, compression, serialization, and buffers Packet Loss: unstable network, network congestion, or too much variable delay in the network
- 37. ?u ?i?m ?u ?i?m: Gi?m chi ph¨ª cu?c g?i (c¨¢c cu?c g?i ???ng d¨¤i v¨¤ qu?c t?) T¨ªch h?p m?ng tho?i, m?ng s? li?u v¨¤ m?ng b¨¢o hi?u Kh? n?ng m? r?ng
- 38. ?u ?i?m Truy?n voice d??i d?ng s? n¨ºn ch?ng ???c nhi?u t?t Ti?t ki?m b?ng th?ng Kh? n?ng ?a dich v? (multimedia) Nhi?u t¨ªnh n?ng m?i T¨ªnh c? ??ng
- 39. Nh??c ?i?m Chi ph¨ª ??u t? ban ??u l?n. V?n ?? v? b?o m?t. V?n ?? v? ngu?n ?i?n. K? thu?t ph?c t?p. Kh¨® ??t ???c th?i gian th?c (real time). Ti?ng v?ng.
- 40. L?i ¨ªch Gi?m chi ph¨ª ?i?n tho?i ???ng d¨¤i (gh¨¦p k¨ºnh th?ng k¨º thay TDM,v.v¡) ??n gi?n h¨®a: M?ng voice v¨¤ d? li?u d¨´ng chung t?i thi?u h¨®a c¨¢c thi?t b? trong m?t c? s? h? t?ng C¨¢c ?ng d?ng ?a d?ch v? v¨¤ ?a ph??ng ti?n
- 41. ?ng d?ng c?a VoIP D?ch v? tho?i qua Internet Tho?i th?ng minh Dich v? t¨ªnh c??c cho b? g?i Dich v? Callback Web D?ch v? Fax qua IP Dich v? Call Center
- 42. N?i dung tr¨¬nh b¨¤y k? t?i IP Networking and Audio Clarity How to Improve Voice Quality Transporting Modulated Data over IP Networks Processing Voice Packets with Codecs and DSPs
Editor's Notes
- #8: ?? tin c?y r?t cao: m?t khi ???ng n?i ?? ho¨¤n t?t th¨¬ s? th?t tho¨¢t t¨ªn hi?u g?n nh? kh?ng ?¨¢ng k?. B?ng th?ng c? ??nh. ??i v?i ki?u n?i n¨¤y th¨¬ v?n t?c chuy?n th?ng tin l¨¤ m?t h?ng s? v¨¤ ch? ph? thu?c v¨¤o ??c t¨ªnh v?t l? c?ng nh? c¨¢c th?ng s? c¨¤i ??t c?a c¨¢c thi?t b?. C¨® th? d¨´ng k? thu?t n¨¤y v¨¤o nh?ng n?i c?n v?n t?c chuy?n d? li?u cao ho?c n?i n¨¤o c?n truy nh?p d? li?u v?i th?i gian th?c (realtime data access). Tuy nhi¨ºn, c¨¢c v?n chuy?n n¨¤y s? l?y nhi?u t¨¤i nguy¨ºn v¨¤ ch¨²ng ???c c?p cho m?t ???ng n?i d?y cho t?i khi d¨´ng xong hay c¨® l?nh hu?. N¨®i c¨¢ch kh¨¢c, c¨¢c ???ng n?i d? li?u n?u trong th?i gian m? ???ng n?i m¨¤ g?p ph?i c¨¢c n¨²t ??u ?ang b?n d¨´ng cho ???ng n?i tru?c ?¨® th¨¬ bu?c ph?i ??i cho t?i khi c¨¢c n¨²t n¨¤y ???c gi?i ph¨®ng.
- #9: Kh?ng c?n ph?i ho¨¤n t?t m?t m?ch li¨ºn t?c n?i t? m¨¢y g?i ??n m¨¢y nh?n (xem th¨ºm v? k? thu?t chuy?n m?ch ???c d¨´ng trong c¨¢c ???ng d?y ?i?n tho?i). Thay v¨¤o ?¨® l¨¤ c¨¢c ???ng truy?n d? li?u gi?a c¨¢c b? chuy?n m?ch (switcher) s? ???c thi?t l?p m?t c¨¢ch t?m th?i t?ng c?p m?t ?? l¨¤m trung gian v?n chuy?n (hay trung chuy?n) c¨¢c g¨®i t? m¨¢y ngu?n cho ??n khi t?i ???c ??a ch? m¨¢y nh?n. C¨¢c ?o?n m?ch n?i trung chuy?n c?ng kh?ng c?n ph?i thi?t l?p t? tr??c m¨¤ ch? cho ??n khi c¨® g¨®i c?n v?n chuy?n th¨¬ m?i th¨¤nh h¨¬nh. Trong tr??ng h?p t?t ngh?n hay s? c?, c¨¢c g¨®i d? li?u c¨® th? trung chuy?n b?ng con ???ng th?ng qua c¨¢c m¨¢y t¨ªnh trung gian kh¨¢c. D? li?u v?n chuy?n b?ng c¨¢c g¨®i s? ti?t ki?m th?i gian h?n l¨¤ vi?c g?i tr?n v?n m?t d? li?u c? l?n v¨¬ trong tr??ng h?p d? li?u th?t l?c (hay h? h?i) th¨¬ m¨¢y ngu?n ch? vi?c g?i l?i ?¨²ng g¨®i ?? b? m?t (hay b? h?) thay v¨¬ ph?i g?i l?i to¨¤n b? d? li?u g?c. Trong m?ng ph?c t?p th¨¬ vi?c v?n chuy?n s? kh?ng c?n (v¨¤ c?ng kh?ng th?) bi?t tr??c ???c c¨¢c g¨®i d? li?u s? ???c chuy?n theo ng? n¨¤o. K? thu?t n¨¤y cho ph¨¦p n?i g?n nh? v?i s? l??ng b?t k¨¬ c¨¢c m¨¢y t¨ªnh. Th?c t?, n¨® ch? b? gi?i h?n b?i kh? n?ng cho ph¨¦p c?a giao th?c c?ng nh? kh? n?ng n?i v¨¤o m?ng c?a c¨¢c b? chuy?n m?ch v?i c¨¢c m¨¢y. V¨¬ c¨® th? ???c g?i ?i qua c¨¢c ???ng trung chuy?n kh¨¢c nhau n¨ºn th?i gian v?n chuy?n c?a m?i g¨®i t? m¨¢y ngu?n ??n m¨¢y ?¨ªch c¨® th? ho¨¤n to¨¤n kh¨¢c nhau. V¨¤ th? t? c¨¢c g¨®i ??n ???c m¨¢y ?¨ªch c?ng c¨® th? kh?ng theo th? t? nh? khi g?i ?i.