Companies where VoIP is the primary means of exchanging voice conversations use an extended form of PBX known as IP-PBX or Internet Protocol Private Branch eXchange. IP PBX performs all the functions of a traditional PBX such as handling conference calling, transferring of calls, connecting employees to the network using extension numbers and more. The key difference is that in the case of IP PBX, voice transmissions are not sent via normal phone lines, but sent in the form of voice packets over a data network (Internet). IP PBX systems are available as hardware and software.
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