1. VOICE OVER INTERNET PROTOCOL(VOIP)

2. INTRODUCTION TO VOIP • VOIP: A general term for a family of transmission technologies for delivery of voice communications over the Internet or other packet-switched networks. • Other terms frequently encountered and synonymous with VOIP are: • IP telephony • Internet telephony • Voice over broadband • Broadband telephony • Broadband phone

3. FEATURES of VOIP • Important features include: • Voicemail • Caller ID • Conferencing • Forwarding • Unlimited long distance

4. WHY VOIP? • To Eliminate Phone Lines • To Eliminate Long Distance Charges • Number Portability • Computer Telephony Integration (CTI) • Person-To-Person Calling Attempts Wastes Time • Scheduled Audio Conference Calls Are Growing • Calls Are Not Always The Primary Focus Of Attention • Consider A Unified Communications Platform

5. An EXAMPLE: 9-1-1 with VOIP:  

6. BENEFITS OF VOIP • Saves Money and is Cost Efficient • Integration With Audio, Data And Video Applications • Flexible • Ability To Choose Your Own Area Codes • Many Offer Features For Free

7. EXISTING SYSTEM (Page:1) The telephone & technology instruments, are more costly and this cost is avoidable by many companies. Existing system contain some drawbacks. Those are: Delay: Delay causes two problems: Echo and Talker overlap. Echo is caused by the signal reflections of the speaker’s voice from the far-end telephone equipment back into the speaker’s ear. Echo becomes a significant problem when the round-trip delay becomes greater than 50 milliseconds. Talker overlap (or the problem of one talker stepping on the other talker’s speech becomes significant if the one-way delay becomes greater than 250 milliseconds. Processing Delay: The actual process of encoding and collecting the encoded samples into a packet for transmission over the packet network causes this delay.

8. EXISTING SYSTEM (Contd.) Network Delay: This delay is caused by the physical medium and protocols used to transmit the voice data. Network delay is a function of the capacity of the links in the network and the processing that occurs as the packets are transited in the network. Lost-Packet Compensation: Lost packets can be a severe problem, depending on the type of packet network that is being used. Because IP networks do not guarantee service, they will usually exhibit a much higher incidence of lost voice packets. Echo Compensation: Echo becomes a problem in voice-over packet networks because the round-trip delay through the network is almost always greater. Echo is generated toward the packet network from the telephone network.

9. PROPOSED SYSTEM • Has been designed to provide real time voice service over the IP networks. • Designed to overcome the disadvantages such as the cost, maintains quality of service, Echo and talker overlap problem, processing delay, network delay, packet loss, and time delay of the packet across the network.

10. FEASIBILITY STUDY Technical Feasibility: Hardware required = 200MHz or higher clock frequency processor, 32 MB or higher RAM and sufficient disk storage capacity. The software require C++ and NT server. Operational Feasibility: The system offers greater levels of user friendliness. So the users need not have any experience to use it. The processing of the system is very high compared to TCP/IP model. The clients can communicate with his/her peers without echo problem and time delay. Thus the system is operationally feasible. Economic Feasibility: Economic feasibility is the most important aspect of feasibility study. The package being develop is definitely feasible from economic point of view because the software and hardware requirement and the number of operating personnel required for the operation of this project is minimum.

11. FUNCTIONAL REQUIREMENT • Easier to user interface. • An option to select the protocol. • An option to select the server. • An option to select the user. • Voice/Textual Communication facility. • Communication based on selected protocol. • Graphical indication of sending and receiving message. • Connect/Disconnect button.

12. REQUIREMENT ANALYSIS • Interaction with the Server • Interaction with the Client

13. IMPLEMENTATION Deployment of a VOIP infrastructure for public use involves much more than simply adding compression functions to an IP network. Anyone must be able to call someone else, regardless of the location and form of network attachment (telephone, wireless phone, PC, or other device).

14. FUNCTIONS required for VOIP • Functions that are required for a VOIP system include: • Fault Management • Accounting/Billing • Configuration • Addressing/Directories • Authentication/Encryption

15. ABILITIES PROVIDED (page:1) Implementations of full-scale VOIP systems must provide all the “abilities” that are usually taken for granted in open systems (including the PSTN).They are: Interoperability: In a public networking environment different products need to inter-work if any-to-any communication is to be possible. Using common software that has been tested for conformance to all application standards can significantly reduce the cost of product development. Interconnection of VOIP to the PSTN also involves meeting the specific standards for telephone network access. Reliability: The VOIP network, whether by design or through management, should be fault tolerant with only a very small likelihood of complete failure. In particular, the gateway between the Telephone and VOIP system needs to be highly reliable.

16. ABILITIES PROVIDED (page-2) Availability: Sufficient capacity must be available in the VOIP system and its gateways to minimize the likelihood of call blocking and mid-call disconnects. This is more important when the network is shared with data traffic that may cause congestion. Mechanisms for admission control should be available for both the voice and data traffic, with prioritization policies set. Scalability: There is potential for extremely high growth rates in VOIP systems, especially if they prove the equal of PSTN at a much lower cost. VOIP systems must be flexible enough to grow to very large user populations, to allow a mix of public and private services and to adapt to local regulations. The need for large numbers of addressable points may force the use of improved internet protocols such as Ipv6.

17. ABILITIES PROVIDED (contd.) Accessibility: Telephone systems assume that any telephone to call any other telephone and to allow conferencing of multiple telephones across wide areas. This will be driven by functions that map between telephone numbers and other types of packet network address, specifically IP addresses. There must exist gateways that allow every device to be reachable. Viability: Many are claiming significant economic advantages to the implementation of VOIP. These are often based on flat rate prices for internet service, the fact that services such as the “Internet 9-1-1” are not required and that there is no regulatory prohibition against inter-connection of telephone systems with IP systems. Also assumed is that higher performance compression will not be used in the telephone network to reduce costs.

18. PROTOCOLS USED

19. VOIP SECURITY Use a junction box: Often supplied by a VOIP provider with your service package, a junction box brings VOIP directly into your conventional phone without the use of a home computer. This helps insulate your phone from attacks and helps protect your computer from viruses it could pick up through the Internet. Keep strong, private passwords: Create strong passwords to access the service Web sites that store your voice mail and other audio data. Don't share them with anyone. Help secure your own computer: If you use a computer to access your voice mail and VOIP account from a provider's Web site, keep that computer protected with a firewall, regular software updates, antivirus software, anti-spy-ware software and strong passwords.

20. CONCLUSION Today we stand with VOIP something like what we stood with the WWW in the early 1990s. The development speed and it’s widespread impacts can be comparable to that of Internet. Thus, VOIP is truly a growing technology that will expand rapidly, in the years to come.

21. REFERENCES CISCO INFORMATION REPOSITORY: http://tools.cisco.com/search/JSP/search-results.get?strQueryText=VOIP&x=0&y=0&Search+All+cisco.com=cisco.com&language=en&country=US&thissection=f&accessLevel=Guest UCA(BERKELEY) SITE: https://inst.eecs.berkeley.edu/~ee290f/sp04/VoIP-Voice%20over%20Internet%20Protocol.ppt WIKEPEDIA: http://en.wikipedia.org/wiki/Voice_over_IP (MIT WEBSITE): http://web.mit.edu/ist/topics/voip/ (PUDN.COM): http://read.pudn.com/downloads36/sourcecode/comm/fax/116020/exercise/voicetalk/talkclient/talkclientDlg.cpp__.htm

22. THANK YOU