VoIPBy Godson Gera

Introduction

Basic electronic communication system History of electronic communication Introduction to VoIP Benefits of VoIP Detailed description of VoIP

Basic electronic communication system

Source Information

Transmitter Receiver Destination Information

Transmission medium

History of Electronic Communication

1837- Samuel Morse developed the first electronics communication system which uses dots, dashes, and spaces generated through electromagnetic induction.

1876- Alexander Graham Bell and Thomas A. Watson were the first to successfully transfer human conversation

over a crude metallic-wire communications system they called the Telephone (this is the focus of my project)

1894- Guglielmo Marconi successfully transmitted the first wireless radio signals through earth’s atmosphere.

1920- Commercial radio began.

Introduction to VoIP

Traditional Telephone system

VoIP Telephone system

Full blown IP Telephony Solution

Benefits of using VoIP

Reduced call cost Free soft phone to soft phone calling

Detailed Description of VoIP The conversion of the analog voice into IP packets, using a

digital signal processor (DSP) embedded in the phone or using a PC in case of soft phones, which are software programs used with a hand set or headset connected to a PC

Transmitting IP packets over a packet or data network (where the packets travel along with other VoIP packets, data packets, Video over IP packets, etc.), which are sent to appropriate destinations by routers and switches

Conversion of IP packets back to voice (using DSP or computers).

Crescendo

System Architecture and Description

Overview of modules Structure and Relationship User Interface issues

The first module is the one running on the client side “Client Module”

The other running at the server side “Server Module”

Client Module

                        This module will be concerned with the following work load

The registration of the user onto the system Un-registering the user out from the system Transportation of voice packets

Server Module

This module will undertake the following work

  Processing the requests of the user   Maintaining records of the registered users

The Structure & Relationship between Modules

Client Module Location Server Module

Session Module Audio Module

CODEC Module

Request processing Module

User Information maintenance

Transportation Reception Module

Working Relationship of modules

Audio CODEC

Transport

Session

Audio

Transport

Session

CODEC

Location Server

Local Client (Bob)

Remote Client (Alice)

Request Processing

User Information Maintenance

Main GUI of the Crescendo

Conclusion

Advantages of VoIP

Cost reduction on long distance calls. Integration of voice and data networks.

Bandwidth optimization. Long term equipment cost reduction because of the single

physical. Single network also leads to decrement in maintenance and

support costs. This product provides many services on

single platform

Downsides of VoIP

Jitter Echo

Scope for future work

The peer to peer audio transmission can be extended to setup a conference.

Along with audio transmission, video transmission can also be enabled.

Call waiting, call forwarding, and voice mailbox.

Thank You