VoIP or Internet telephony level up

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VoIP or Internet telephony level up

The voice over IP, often referred to by the acronym VoIP, is increasingly in the news but also in companies.
The term VoIP refers to a whole range of technologies implemented to transmit voice between two people, via the Internet rather than traditional telephone networks (IP designating the Internet Protocol, the protocol for data transmission over the Internet) .

In the professional world, the number of VoIP lines grew strongly in 2006, to reach 63 million lines in 2005 (8% lines in the world), against just 7 million in 2002. The development of voice over IP is an extensive movement.

1. Technique: operation of Voice over IP
2. Getting an IP phone number to be called a traditional telephone line
3. Budget: how much a call to voice over IP?
4. Usage: mobility with voice over IP
5. Company: Voice over IP to reduce its communication costs
6. Technique: operation of Voice over IP

The various types of terminals IP
A communication VoIP may be from different terminals. Examples are the most common terminals:

To make a call from a computer, it must, in addition to a microphone to transmit sound, a dedicated telephone software, a "soft phone". This software will take charge of capturing the votes, transform and transmit. Some instant messaging software allow this kind of communications, while others are limited to voice. In the same way, some software is limited to permit an appeal VoIP software program, while others allow it, against payment, the use of a gateway to traditional voice networks.

There are on the market a number of VoIP phones that transform themselves voice into digital data. According to the model, they can connect to a computer network or a traditional telephone line.
The traditional telephone associated with an adaptor

There are adapters that allow a traditional phone to make calls to VoIP. They s'intercalent between the phone and making access to the Internet to transform voice into digital data, as shown below.
From VoIP to VoIP

The provision of a system of voice over IP to another VoIP system is normally free. The only condition for this is that the 2 systems are technically compatible with each other. The standard open communication of voice over IP called Session Initiation Protocol (SIP). It helps ensure interoperability between different systems, voice over IP. However, it is not mandatory, and is therefore not adopted by all terminals IP (software or telephones). Some software and widespread use of proprietary standards and provide only gateway to traditional telephony.
From VoIP to traditional telephony

Many service providers permit, against payment, to use their gateway to the switched telephone network. The tariffs are usually close to those of a local call, even abroad. The following diagram explaining the reasons:

Call VoIP to a traditional voice terminal at a cost of a local call
In a call to voice over IP, gateway ensuring the transfer to the network is placed closer to the recipient of the call. The distance crossed on the traditional network is therefore minimal. Unlike a call to voice over IP, an international appeal by the traditional network must cross a border and support usual costs of such communication.
Communication costs of traditional telephone network to an IP number are identical ä those who would be paid to a traditional number.

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