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Presented By:- Yash Jariwala Paras Patel Deep Amrutiya.

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Presentation on theme: "Presented By:- Yash Jariwala Paras Patel Deep Amrutiya."— Presentation transcript:

1 Presented By:- Yash Jariwala Paras Patel Deep Amrutiya

2 What is VOIP ? 2

3 General Definition 3 VOIP stands for Voice Over Internet Protocol. VoIP is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, voice over broadband (VoBB)

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. 4

5 Modes of Internet Telephony 5 PC-to-PC Vendors:- Skype, EarthLink PC-to-Phone Vendors:- Net2Phone Phone-to-Phone Vendors:- Vonage, AT&T Call Vantage, VoicePulse,Packet 8

6 Why VOIP ? 6

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 ……… 7

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

9 9 PSTN 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 VOIP 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 PSTN V/s VOIP

10 How it works ? 10

11 11 1.Your voice is converted from an analog to a digital signal. 2.The digital signal is broken up into packets. 3.The packets are sent to the destination via Internet Protocol (IP). 4.The packets are reassembled into a digital signal at the destination. 5.The digital signal is converted to an analog signal and played back through the receiver. How VoIP Works

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

13 VIRTUAL LAB

14 SIP SESSION INITIATION PROTOCOL RTP REAL-TIME TRANSPORT PROTOCOL PROTOCOLS

15 SIP FlOW CHART

16 SIP INVITE PACKET

17 RTP PACKET

18 IP Telephony Standards and Protocols 18 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 19 Telecommunications Industry (PSTNs) Corporations and Campuses Medium to Small Businesses Residential Users Where VoIP is Used

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 PCs and Macs WiFi Phones up and coming 20

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

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

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. 23

24 Thank You !!! 24


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