Telephony is used describe the science of transmitting voice over a telecommunications network. Voice over Internet Protocol, is another way of saying IP Telephony. It involves the transmission of telephone calls over a data network like the Internet. In other words, VoIP can send voice, fax and other information over the Internet, rather than through the (PSTN) or regular telephone network.
BTS.InterVoice software has everything you need to starts own interactive voice response system at home phone line. Automated call answer, call processing and recording voice messages.