Tuesday, February 9, 2010

PC to Phone Calls to India from Foreign Lands

Voice over Internet Protocol is perhaps one of the best changes that has taken place in the world and is now being able to give Indian citizens the chance to enjoy free calls due the highly relieving innovations which have been made in this particular genre of communication.



VoIP started off in the year 1973 as an experimental creation known as network voice protocol being created by talented scientists especially for improving the performance of ARPANET service providers. The time jingled on to the point of realisation of business capabilities by becoming a communication medium for the common public and for the enhancement in the features involved in making international calls and also national calls. One of the major features which is now one of the main reasons for the success of the VoIP technology is to be able to take to friends by making absolutely free calls.




The major processes that are involved in the actual process that take place when a person makes a phone call with a tool which uses this technology is quite complex and is liable to be understood mostly by Telecom engineers and persons involved in some way or other in the technical back end process that takes place when a call is being made.



However the prospect of understanding the working of this technology is not bleak due to the overlying simplicity of the basic concept behind this technology. Hence when a person makes PC to Phone calls to India, the primary event that takes place is the modification of the sounds of his voice into digital packets of information which are then sent over a network to the phone of the person to whom he is making the call too. Both of these persons have the requirements for being able to make free phone calls, as being very few in number. Hence all that the person needs to make free calls to India is an free account with a VoIP service provider and a computer with the necessary software and a modem.



The benefits that are a feature of making free calls are evident by the word 'free' itself and hence, the user is able to make calls to his friends and talk for lengthy periods of time without having to pay a single symbol of monetary worth. Therefore, the need to pay a single penny, or a cent or even a paisa is completely nullified. Another major benefit is the fantastic quality of sound that the person hears when he makes a call with another one being the basic service being available in the form of numerous offers being available by the different service providers.



The feature of being able to make free PC to phone calls is hence now quite real and hence Indians regardless of the place where they are living, are able to make calls and those too free and hence, become capable of remaining in touch with their friends and relatives living in the wonderful abode known as India.Calls to India can now be made without the need to think about international call rates and how to talk with the minimum of sentences due to this feature being available quite easily. There are quite a lot of websites of various service providers who offer the feature of making free Phone calls to India and hence, the person who wants to talk to someone who is living in India can do so without having to worry about the bill that he has to pay (which in the old days, used to be quite a large one in the case of making long phone calls and also quite considerable even if the person making the call was watchful enough to keep the small time period of the call.).


The result of advances being made for the better in the Indian economy has led to an increase in the overall living standards of the Indian people and hence, the computer is now becoming quite a routine feature in most of the households of urban centres of this fantastic country. The result is the increase in free PC Phone calls being made, due to the increase in the number of people who are learning the process of making free calls.

Networking Jobs Interview questions

Here are the basic interview questions for the network administrators, system administrators and IT manager posts. These questions provide the basic information about the network communication technology, network topologies, network troubleshooting techniques, network devices and the basic overview of the LAN/WAN communication model.
What is DHCP?
DHCP stands for Dynamic Host Configuration Technology. The basic purpose of the DHCP is to assign the IP addresses and the other network configuration such as DNS, Gateway and other network settings to the client computers. DHCP reduces the administrative task of manually assigning the IP addresses to the large number of the computers in a network.
What is DNS and how it works?
DNS stands for Domain name system and it translates (converts) the host name into the IP address and IP address into to the host name. Every domain and the computer on the internet is assigned a unique IP address. The communication on the internet and in the network is based on the IP addresses. IP addresses are in this format 10.1.1.100, 220.12.1.22.3, 1.1.1.1 etc. IP addresses can't be remembered but the host names (e.g. www.networktutorials.info, xyz.com, abc.com) are easy to remember instead of their IP addresses.
What is a Firewall?
Firewall is a protective boundary for a network and it prevents the unauthorized access to a network. Most of the Windows operating system such as Windows XP Professional has built-in firewall utilities. There are the large number of the third party firewall software and the basic purpose of all the firewall software and hardware is same i.e. to block the unauthorized user access to a network.
What is WAN?
WAN stands for wide area network and it covers the broader geographical area. Basically there are three types of a computer network LAN (Local Area Network), MAN (Metropolitan Area Network) and WAN (Wide Area Network). The communication in a WAN is based on the Routers. A WAN network can cover a city, country or continents.
Define VOIP Communication Technology
VOIP stands for Voice over IP and this technology is used for transmitted the voice over the IP based long distance network to make phone calls. VOIP phone calls are very cheap and a large number of the corporate offices and home users are using VOIP technology to make long distance phone calls.
What is Wi Max Technology?
Wi Max is a wireless broadband technology and it is a advance shape of the Wi Fi (which was a base band technology). Wi Max supports data, video and audio communication at the same time at a very high speed up to 70 Mbps.Define Network GatewayNetwork Gateway can be software or a hardware. A gateway is usually a joining point in a network i.e. it connects two networks. A computer with two LAN cards can act as a gateway.
What is a Router?
A router routes the traffic to its destination based on the source and destination IP addresses, which are placed in the routing software known as routing table.How Fiber Optic Cable WorksFiber optics provides the fastest communication medium for data and voice. Data can travel at the speed of light through the fiber optic cables. ISPs and corporate offices are usually connected with each other with the fiber optic cables to provide high speed connectivity.
What is File Server?
A file server is a computer in a network that authenticates the user access in a network such as Windows 2000/2003 Servers.
Define Seven Layers of OSI Model
There are seven layers of the OSI model. The basic purpose of these layers is to understand the communication system and data transmission steps. The seven layers are Application, Presentation, Session, Transport, Network, Data Link and Physical. You can remember the name of these layers by this phrase. “All people seems to need data processing".
Define GSM Technology
GSM is a short range wireless technology and is usually used in the mobile phones, hand help devices, MP3 players, Laptops, computers and in cars.