1. VoIP -Voice over Internet Protocol

2. Introduction VoIP – revolutionary technology
Its purpose: analog audio signal to digital signals conversion
Main Benefits: cost-effective and portability

3. Historical Background
Available for end-users in the 1990’s
The first VoIP application was introduced in an "Internet Phone".
Examples of the first VoIP services include:
“Vocal Tec” Internet Phone Release 4 (1996)
Level 3 (1997)
Problems in “Vocal Tec” resolved in Level 3

4. What is VoIP?
VoIP is a term used in IP telephony for a set of facilities for managing the delivery of voice information using the Internet Protocol (IP).
"Voice over IP is the technology of digitizing sound, compressing it, breaking it up into data packets, and sending it over an IP (internet protocol) network where it is reassembled, decompressed, and converted back into an analog wave form."

5. Alternative VoIP Architectures PC To PC
Internet

6. Phone to Phone via the Internet

7. Phone To Internet To Gateway To PSTN

8. PSTN To Gateway To Internet To Gateway To PSTN

9. Components Of VoIP The main components of VoIP are:- Voice Processing.
Call Processing.
Packet Processing.
Network Management.

10. Requirements Of VoIP Software Requirements. Hardware Requirements.
Protocol Requirements.

11. Software Requirements
Voice Processing Module.
PCM Interface.
Echo Cancellation.
Idle Noise Detection.
Tone Detector.
Packet Voice Protocol.
Voice Playback Module.
Call Signaling Module.
Packet Processing Module.
Network Management Protocol.

12. Hardware Requirements
IP based network.
Gateway.
PC.
Voice cards.
IP telephones.

13. Protocol Requirements
H.323
G.723.1
G.711
Real Time Transport Protocol
Resource Reservation Protocol

16. VoIP Examples XBOX Voice. Windows Messenger. AOL Instant Messenger.
Motorola Phone Adapter (Vonage).
Cisco Phone.
COX Cable in Hampton Roads, Virginia.

17. Advantages of VoIP Cost-effective. No geographical limits. Mobility.
Use of existing networks.
Efficient utilization of bandwidth.
Single network infrastructure.
Support and independence.

18. Conclusion
VoIP is one of the higher level communication capabilities among devices connected to the internet.
VoIP is not an application but a capability that is a part of many applications.
Striking a balance between security and the business needs of the organization is key to the success of the VoIP deployment.

19. References Computer Networks by Andrew S.Tanenbaum
Internetworking with TCP/IP by Douglas E.comer

20. Thank You