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PURC 2004
ASEMINAR
ON “VOICE OVER INTERNET PROTOCOL”
SUBMITTED BY: -
SATYA PRAKASH VYAS
PURC 2004
INTRODUCTIONINTRODUCTION
Voice over Internet Protocol (VoIP) is a Voice over Internet Protocol (VoIP) is a transmission technology for delivery of voice transmission technology for delivery of voice communications over IP networkscommunications over IP networks..
Internet telephone call are conversion of the Internet telephone call are conversion of the analog voice signal to digital format and analog voice signal to digital format and compression/translation of the signal into compression/translation of the signal into Internet protocol packets.Internet protocol packets.
With VoIP, we can make a call from anywhere if With VoIP, we can make a call from anywhere if we have broadband connectivity we have broadband connectivity
PURC 2004
RoadmapRoadmap
• Basics of packet communications as Basics of packet communications as used in the Internetused in the Internet
• How voice is transmitted over packet How voice is transmitted over packet networks such as the Internet.networks such as the Internet.
• Examples of VoIP uses and systems Examples of VoIP uses and systems
• Concluding thoughtsConcluding thoughts
PURC 2004
Making rules for VOIPMaking rules for VOIP
IETF (INTERNET ENGG. TASK FORCE)IETF (INTERNET ENGG. TASK FORCE)
This community of engineers that This community of engineers that standardizes the protocol that defines how standardizes the protocol that defines how the internet and internet protocol work the internet and internet protocol work
ITU ( INTERNATIONAL TELICOMM. UNION)ITU ( INTERNATIONAL TELICOMM. UNION)
An international organization where govt. An international organization where govt. & private sector coordinate global telicom & private sector coordinate global telicom network and servicesnetwork and services
PURC 2004
PURC 2004
PURC 2004
Various Types of Protocols Various Types of Protocols
• MEGACO(H.248) [media gateway con.pro.]MEGACO(H.248) [media gateway con.pro.]
• MGCP (H.323) [media gateway con. Pro.]MGCP (H.323) [media gateway con. Pro.]
• RVP [ remote voice protocol]RVP [ remote voice protocol]
• SIP [session initiation protocol ]SIP [session initiation protocol ]
PURC 2004
Protocol LayeringProtocol Layering
Physical Transport (e.g, Cable Modem)
IP (Internet Protocol)
TCP UDP
Applications (e.g., email, web pages)
Email Data (1000 bytes)TCP Header (20 bytes)
IP Header (20 bytes)
A Typical IP Datagram
PURC 2004
Alternative VoIP ArchitecturesAlternative VoIP Architectures
• PC to PC
InternetInternet
PURC 2004
Alternative VoIP ArchitecturesAlternative VoIP Architectures
• Phone to Phone via the Internet
InternetInternet
PURC 2004
Alternative VoIP ArchitecturesAlternative VoIP Architectures
• Phone to Internet to Gateway to PSTN
InternetInternetGATEWAY
PSTNPSTN
PURC 2004
VoIP ExamplesVoIP Examples
• Xbox Voice
• Windows messenger
• AOL Instant Messenger
• Motorola Phone Adapter (Vonage)
• Cisco Phone
PURC 2004
Vonage Uses this ArchtectureVonage Uses this Archtecture
• Phone to Internet to Gateway to PSTN
InternetInternetGATEWAY
PSTNPSTN
PURC 2004
Motorola Box in Vonage ArchitectureMotorola Box in Vonage Architecture
InternetInternetGATEWAY
PSTNPSTN
PURC 2004
Cisco 7970 IP PhoneCisco 7970 IP Phone
PURC 2004
Service provide by voice over IPService provide by voice over IP
• PHONE TO PHONE PHONE TO PHONE
• PHONE TO PCPHONE TO PC
• PC TO PHONEPC TO PHONE
• FAX TO E-MAIL FAX TO E-MAIL
• E-MAIL TO FAXE-MAIL TO FAX
• FAX TO FAXFAX TO FAX
• WIRELESS CONECTIVITYWIRELESS CONECTIVITY
• PABX & SOFT SWITCH PABX & SOFT SWITCH IMPLEMENTATIONIMPLEMENTATION
PURC 2004
The Power Of VoIPThe Power Of VoIP
cheaper than PSTN service providerscheaper than PSTN service providers compatible with web-based applicationscompatible with web-based applications enabling the user to change, adjust , or listen enabling the user to change, adjust , or listen
to these features to these features
• over the Internet.over the Internet. Long distance is usually provided free of Long distance is usually provided free of
charge. charge.
PURC 2004
Concluding ThoughtsConcluding Thoughts
• VoIP is one of many higher-level communications capabilites among devices connected to the Internet.
• VoIP is not an application.
• VoIP is a capability that is part of many applications.
• VoIP capabilities are already pervasive.
PURC 2004
THANKS FOR
YOUR KIND
COPERATION
