Summary
IP telephony is a technology that enables the existing intranets and internetworks to be used as a substitute for a traditional telephone system such as the Public Switched Telephone System (PSTN). One of the subsets of IP telephony that is used for transferring voice over an IP-based network is called Voice Over Internet Protocol (VoIP). Sending and receiving voice communications over an IP-based network is less expensive in many ways compared to the costs incurred on the same in PSTN. Audio files can be transmitted over an IP-based network just like any other data file.
The first set of standards that were introduced for transmitting voice were the H.323 specifications. The H.323 specifications are a group of protocols and ...
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