Definition: Internet telephony (IPT) is transport of telephone calls over the Internet, no matter whether traditional telephony devices, multimedia PCs or dedicated terminals take part in the calls and no matter whether the calls are entirely or only partially transmitted over the Internet.
The most significant benefit of IPT and driver of its evolution is money-saving and easy implementation of innovative services:
But: The wide business deployment is still hindered by lower quality of voice over IP, particularly by higher delay and jitter. Also many technical aspects of accounting, billing, charging , roaming etc. remain open yet.
The IPT usage scenarios are commonly classified by the type of devices terminating an Internet call. Because there may be either a PSTN device or a data-oriented terminal on each side of a call, there are 4 generic classes. Note, that although "PC" is a well established term, any device capable of transmitting voice over data network may apply in this context. See for example the dedicated device Aplio/phone.
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