VoIP

VoIP is the abbreviation of the term 'Voice over Internet Protocol'. It is basically the transmission of voice traffic over Internet protocol or IP- based networks. VoIP systems use session control protocols. These protocols control the set-up and overall tear-down of calls and audio codecs, which guarantee a digital audio transmission of the speech over an IP network.

How it works?

The working of VoIP is very simple. In this, the user establishes a hi-speed broadband connection over a router and a VoIP gateway. The VoIP gateway is a network device which helps to convert voice and fax calls between a Public Switched Telephone Network (PSTN) and an Internet Protocol (IP) network. This gateway is placed somewhere in direct proximity of the connected Internet service. It converts the analog signals into digital format which are in turn bifurcated into smaller 'packets'. This process is similar to the data transmission that takes place in a computer. These packets embedded with instructions are then sent to their final destination. Once this process is over, these packets pass through (with instructions from the other side) another gateway where they are reconverted into the normal analog format by the Public Switched Telephone Network (PSTN). This function of the packets routing the call to the number the caller has dialed, thus completing the conversation.

Equipments required

You will require a broadband or a high speed Internet connection to use VoIP. It can be a local area network, a cable modem or high speed services such as DSL. You will also require a computer, a specialized phone or an adaptor. Some VoIP services allow you to use a traditional phone, which you can connect to a VoIP adapter whereas some work only on your computer or require a special VoIP phone. The special VoIP phones come with an advantage and you can use them simply by plugging into the broadband connection. In case you use your computer, you will require some software and a microphone.

What are VoIP phones?

Voice over Internet protocol phones are telephones that connect to VoIP networks instead of PSTN. They are also available in different forms depending on the types of connection. The basic types are:

• VoIP phones with Wi-Fi/ 802.11 connections
• Software VoIP phones
• Phones connected with dialup modem connections
• VoIP phones with Ethernet connections

Types of VoIP calls

You can use your standard Internet connection to make free phone calls. There are many free VoIP softwares that allow you to make free phone calls. There are different ways you can make calls using VoIP, some of these include.

1. ATA: The simplest way is by using Analog Telephone Adaptor (ATA). This adaptor allows you to connect your standard phone to the computer. The ATA is an analog to digital converter. It takes your analog telephone signal and converts it to digital format for transmission over the Internet. You can simply buy an ATA, plug it between your phone and computer and you are ready to make calls using VoIP.
2. IP Phones: These phones are similar to normal phones. However, they have a RJ-45 Ethernet connector instead of RJ-11 connector found in standard phone. These phones have the necessary hardware and software onboard to handle the IP call. They are connected directly to a router. Wi-Fi phones allow subscribers to make a VoIP call from any Wi-Fi spot.
3. Computer to Computer: This is the easiest way to make calls using VoIP. You need a microphone, speakers, a sound card, software and a fast Internet connection such as DSL modem or cable Internet. You can find much low-cost or free VoIP software available on Internet. You do not have to pay any additional fee other than monthly ISP charges, if you are making calls using VoIP.

VoIP benefits

There are several benefits of using VoIP. Firstly, it will help you to save money as the calls made through VoIP cost nothing as compared to calls made through traditional phones. Due to its ability to reach long distances and that too at a low cost than other traditional phone networks, it has created a separate niche for itself in the entire arena of communication tools.

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