VoIP – ce este si utilitatea acestuia in zilele noastre

Daca nu ati auzit niciodata despre VoIP, fiti pregatiti pentru a va schimba radical viziunea dumneavoastra privitoare la apelurile telefonice la distante mari. VoIP, sau Voice over Internet Protocol, este o metoda prin care semnalul audio analogic (semnalul tipic unui telefon clasic) este tranformat in semnal digital spre a putea fi trimis pe internet sub forma unor pachete de date de tip IP (TCP-IP este suita de protocoale care sta la baza internetului actual).
De ce ne este util ? VoIP poate transforma o conexiune la internet obisnuita intr-o modalitate de a telefona gratuit. Acest lucru poate fi realizat utilizand un software VoIP disponibil gratuit pe internet pentru a realiza apeluri telefonice intre utilizatori, ajungand chiar la evitarea costurilor implicate de telefonia clasica.
VoIP este o tehnologie revolutionara ce are potentialul de a revolutiona complet lumea sitemelor de telefonie. Atat in lume at si in Romania au aparut furnizoti de servicii de voce care folosesc tehnologia VoIP, iar numarul acestora este in crestere.

VoIP este, metaforic vorbind, o “reinventare inteligenta a rotii”. Urmeaza prezentarea brincipiilor ce stau la baza VoIP, a aplicatiilor acestuia si a potentialului acestei tehnologii de a inlocui in viitor in intregime telefonia clasica.

Cel mai incitant este faptul ca VoIP ne ofera mai multe posibilitati de a telefona, in prezent putem aminti 3 variante diferite:

  • ATA – The simplest and most common way is through the use of a device called an ATA (analog telephone adaptor). The ATA allows you to connect a standard phone to your computer or your Internet connection for use with VoIP. The ATA is an analog-to-digital converter. It takes the analog signal from your traditional phone and converts it into digital data for transmission over the Internet. Providers like Vonage and AT&T CallVantage are bundling ATAs free with their service. You simply crack the ATA out of the box, plug the cable from your phone that would normally go in the wall socket into the ATA, and you’re ready to make VoIP calls. Some ATAs may ship with additional software that is loaded onto the host computer to configure it; but in any case, it is a very straightforward setup.
  • IP Phones – These specialized phones look just like normal phones with a handset, cradle and buttons. But instead of having the standard RJ-11 phone connectors, IP phones have an RJ-45 Ethernet connector. IP phones connect directly to your router and have all the hardware and software necessary right onboard to handle the IP call. Soon, Wi-Fi IP phones will be available, allowing subscribing callers to make VoIP calls from any Wi-Fi hot spot.
  • Computer-to-computer – This is certainly the easiest way to use VoIP. You don’t even have to pay for long-distance calls. There are several companies offering free or very low-cost software that you can use for this type of VoIP. All you need is the software, a microphone, speakers, a sound card and an Internet connection, preferably a fast one like you would get through a cable or DSL modem. Except for your normal monthly ISP fee, there is usually no charge for computer-to-computer calls, no matter the distance.

Adaptare in limba Romana dupa Howstuffworks si alte surse.

Articol oferit de www.ovitel.info

Slackware ip aliasing sample

In slackware 10.2 rc.inet1.conf suporta ip aliasing, dupa cum se poate vedea in exemplul:

# Config information for eth0:1
IFNAME[1]=”eth0:1″
IPADDR[1]=”192.168.1.1″
NETMASK[1]=”255.255.255.0″
USE_DHCP[1]=””
DHCP_HOSTNAME[1]=””