IP telephony refers to the system of transmitting voice over a data network such as in broadband Internet connection. In comparison to the traditional analogue phone line, as an extension to the practical Internet applications, it presents a cheaper and more accessible option to communicating with people from any part of the world. With its call sound quality that is comparable and sometimes better that that observed in analogue telephone conversations, it presents a modern and improved system for call management having total flexibility in using and locating phone numbers.
IP telephony, broadband telephony or Voice over Internet Protocol (VoIP) applications is operated over the Internet through packets of switched network. It introduces a system of voice transmission that carry telephony signals as digital audio, which reduces data, rate through speech data compression methods. It encapsulates the digital audio signals into the data packet stream over the IP. In sense, as a particular call is made, the conversation is broken down into tiny packets for faster and clearer transmission, which is then reassembled at the receiving end. One common misconception about IP telephony is that it needs to access a computer to operate. That is not the case; however, it does need a broadband Internet connection to operate.
A VoIP service usually comes in two types of public switched telephone networks (PSTN), the access numbers and the direct inward dialling (DID). In access numbers service, the caller is required to have the extension number of the person called through VoIP. It needs to key in the extension number of the person being contacted. On the other hand, DID presents more convenient and direct solutions to callers; it does not need codes or extension numbers to contact another VoIP user. The great thing about these services is that they provide solutions to the difficulties encountered in implementing traditional PSTN calls.
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