How does VOIP work? - Computers - Networks

Voice over IP (VOIP) is an IP telephony which includes number of services which are used for working calls or for the transference of voice data through Internet. VOIP sends voice data in the form of digital signals by sending voice packets instead by sending voice packets instead of regular telephonic circuit. VOIP has an edge over regular telephonic service because it is economical and cuts your telephone bills as most of its calls are free. Working of VOIP VOIP changes voice into digital signals that not on through internet. This signal is retranslated to regular signal when it reaches a regular telephone. VOIP enables you to make calls by your computer or by a special VOIP phone or regular phone linked to your computer via an adopter you are also make use of wireless VOIP services at all public places like airport, parks , caps etc.

Calls made through VOIP need:

1. Media channel setup

2. Analog voice signal digitalization

3 Encoding

4 Packeting

5 Transmission of IP packets

6 Packet switched network

To get the signal and make a call through you need

1 packet decoding at the receiving end

2 conversation of analog signal to digital signal

3 IP packet reception

Audio code's is used by VOIP which encode voice and transmit it through IP network. Code used depends on network bandwidth and the requirements of the application like high fidelity stereo code's or compressed speech. VOIP is used by devices that use internet so that phone call can be made wirelessly or text message can be send lift through Wi-Fi or 3g.Analog voice calls are converted by VOIP into data packets that move through Internet. We can make calls by VOIP both from computer to computer or from mobile to landline. To obtain a VOIP service you only need a VOIP phone it can be a VOIP phone which is connected to the network via Wi-Fi or wired Ethernet like your regular phone. Analog phone adapter's implements the firm ware and electronics to operate a regular analog phone attached through a phone jack. Some cable modems also have this function. Computers use soft phone or a VOIP software. This application allows you to make call through your computer and presents you a keyboard or mouse operated dial up on your display screen. A proper way is needed to convert analog phone signed into digital signal by VOIP which is then transmitted through internet. This functionally is in a phone itself or a separate box like ATA is used.

VOIP using an ATA

Regular phone----- ATA------- Ethernet------ Router------- Internet-------- VOIP service provider

VOIP using IP phone.

IP Phone------- Ethernet------- Router------ Internet----- VOIP service provider

VOIP connecting directly

IP Phone ------- Ethernet--------Router--------Internet -------- Router -------- Ethernet ------- IP Phone

access point vs router