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DCN_misc_topics_VoIP - VOICE OVER IP B Sainath EEE Dept...

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VOICE OVER IP B. Sainath EEE Dept., BITS PILANI NOV. 2015 B. Sainath (BITS, PILANI) VoIP NOV. 2015 1 / 14
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Outline 1 INTRODUCTION 2 PROTOCOL FEATURES 3 APPLICATIONS 4 MULTIMEDIA PROTOCOLS 5 CONCLUSIONS 6 REFERENCES B. Sainath (BITS, PILANI) VoIP NOV. 2015 2 / 14
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INTRODUCTION Voice-over-Internet-Protocol (VoIP) /Video-over-IP Internet telephony standard & Internet phone service uses Internet infrastructure to route calls VoIP converts phone calls into data Sender fills packet with encoded speech before passing to the Internet Packetization delay: time to fill a packet Public Switch Telephone Network (PSTN) Architecture built for voice Fairly complex, expensive, cannot create and deploy new features quickly Data/voice/video cannot converge B. Sainath (BITS, PILANI) VoIP NOV. 2015 3 / 14
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VoIP BENEFITS Why VoIP? Better utilization of bandwidth by using compression techniques unified processing of traffic Ability to introduce new services voice and video conferencing, distance learning eg. Skype, Google talk Standards & protocols H.323: first VoIP standard, provides protocols for audio-visual communication over packet network session initiation protocol (SIP): Protocol for voice and video communication B. Sainath (BITS, PILANI) VoIP NOV. 2015 4 / 14
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