As with many inventions of the 20th century, the internet has drastically changed using the phone. Once a vital necessity in every building, PBX boxes are driven towards extinction by devices supporting Voice over Internet Protocol (VoIP).
As the name implies, VoIP allows making calls via the internet and serves as a perfect solution for businesses seeking to get the best of two, GSM-based and internet-based, worlds. Usually, VoIP devices employ a session initiation protocol (SIP) to transmit various forms of media.
