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Presented By:- Yash Jariwala Paras Patel Deep Amrutiya

Presented By:- Yash Jariwala Paras Patel Deep Amrutiya. What is VOIP ?. General Definition. What is Internet telephony ?.

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Presented By:- Yash Jariwala Paras Patel Deep Amrutiya

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  1. Presented By:- Yash Jariwala Paras Patel Deep Amrutiya

  2. What is VOIP ?

  3. General Definition

  4. What is Internet telephony ? The term Internet telephony specifically refers to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN). The steps and principles involved in originating VoIP telephone calls are similar to traditional digital telephony, and involve signaling, channel setup, digitization of the analog voice signals, and encoding.

  5. Modes of Internet Telephony

  6. Why VOIP ?

  7. History • Before VOIP people were using PSTN. • PSTN stands for Public Switched Telephone Network, also known as Plain Old Telephone Service (POTS) uses what's called circuit-switched telephony. This system works by setting up a dedicated channel (or circuit) between two points for the duration of the call. These telephony systems are based on copper wires carrying analog voice data over the dedicated circuits. • On the other side ………

  8. VOIP is newer Internet telephony networks based on digital technologies. It’s in contrast with PSTN system. Using this system, the voice information travels to its destination in countless individual network packets across the Internet.

  9. PSTN V/s VOIP • PSTN • VOIP • Dedicated Lines • Each line is 64kbps (in each direction) • Features such as call waiting, Caller ID and so on are usually available at an extra cost • Can be upgraded or expanded with new equipment and line provisioning • Long distance is usually per minute or bundled minute subscription • Hardwired landline phones (those without an adapter) usually remain active during power outage • When placing a 911 call it can be traced to your location • All channels carried over one Internet connection • Compression can result in 10kbps (in each direction) • Features such as call waiting, Caller ID and so on are usually included free with service • Upgrades usually requires only bandwidth and software upgrades • Long distance is often included in regular monthly price • Lose power, lose phone service without power backup in place • 911 emergency calls cannot always be traced to a specific geographic location

  10. How it works ?

  11. How VoIP Works • Your voice is converted from an analog to a digital signal. • The digital signal is broken up into packets. • The packets are sent to the destination via Internet Protocol (IP). • The packets are reassembled into a digital signal at the destination. • The digital signal is converted to an analog signal and played back through the receiver.

  12. VIRTUAL LAB ON PACKET TRACER Requirements:-> • CISCO 2811 - Unified Communication manager Express. - It Supports Voice. • CISCO 2621XM - As a DHCP server • IP phones • TFTP SERVER

  13. VIRTUAL LAB

  14. SIPSESSION INITIATION PROTOCOL PROTOCOLS RTP REAL-TIME TRANSPORT PROTOCOL

  15. SIP FlOW CHART

  16. SIP INVITE PACKET

  17. RTP PACKET

  18. IP Telephony Standards and Protocols H.323 • H.323 is a recommendation from the ITU Telecommunication Standardization Sector. The H.323 standard addresses call signaling and control, multimedia transport and control, and bandwidth control for point-to-point and multi-point conferences. SIP • The Session Initiation Protocol (SIP) is used for controlling multimedia communication sessions such as voice and video calls over Internet Protocol (IP) networks. MGCP • MGCP uses the Session Description Protocol (SDP) for specifying the media streams to be transmitted in a call session and the Real-time Transport Protocol (RTP) for framing of the media streams. H.248 • It is an implementation of the Media Gateway Control Protocol Architecture. H.248 is also called Megaco in IETF domain. It is now known as Gateway Control Protocol.

  19. Where VoIP is Used • Telecommunications Industry (PSTNs) • Corporations and Campuses • Medium to Small Businesses • Residential Users

  20. Ways to Get VoIP • Replace Your Telephone Service • Alternate Providers for Business and Residential • Discounts for Multiple Services (Phone and Internet) • Rich Set of Standard Features • Flat Monthly Fee, Unlimited Calling • Replace Your PBX • Pure IP Systems • Hybrid Systems, the Best of Both Worlds • Affordable Small PBX Systems (TalkSwitch) • Replace Your Phones • IP Phones (Skype and IP PBX) • Softphones; Software for PC’s and Macs • WiFi Phones up and coming

  21. Advantages of VOIP • Save a lot of money • Cheap user hardware and software. • More than voice • Tele-working • Fax over IP

  22. Disadvantages of VOIP • Security • Voice quality • Bandwidth dependency • Power dependency • Emergency calls

  23. Conclusion An increasing number of businesses are opting to replace their Public Switched Telephone Networks (PSTNs) for cheaper VoIP alternatives. But the PSTN vs. VoIP debate is still going strong. And both has their own uses separately.

  24. Thank You !!!

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