| Voice over Internet Protocol (VOIP) provides people, | | | | converted back to audio for the person at the |
| who own a computer and fast internet access, the | | | | destination to hear. ADSL routers use a protocol, |
| chance to make and receive phone calls to and from | | | | commonly known as SIP or Session Initiation Protocol, |
| anyone in the world at a small cost. Some are even | | | | to register a computer to the online VOIP service |
| free. The technology has become great news and | | | | provider. After registering, a person can now make or |
| many are catching up. But how do you avail of the | | | | receive calls to other VOIP ADSL users or PSTN |
| service? Well, there are a number of ways to choose | | | | (Public Switched Telephone Network) subscribers |
| from. One is by plugging an internet phone bundled with | | | | through the service provider's gateway. |
| software to run on the computer. Another is opting for | | | | There are other pluses to using VOIP ADSL. One is |
| a VOIP ADSL. | | | | that you can use an ordinary analog phone to make |
| VOIP ADSL only means that an ADSL (Asynchronous | | | | phone calls from the computer by connecting the |
| Digital Subscriber Line) router is connected to a | | | | handset to the router with the corresponding |
| computer. This router has a VOIP adapter built-in, | | | | connector. Another good thing is that the user can still |
| which enables the router to convert phone calls into IP | | | | use the handset phone in the event of emergencies or |
| packets and back again. Audio data from computer | | | | power outages. Also, there are router features that |
| phone calls then gets transmitted through an ADSL | | | | one can get for better system security such as |
| connection after they are converted. | | | | firewall protection. |
| The IP packets received from transmission is then | | | | |