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    There are many different standards and groups of standards in Internet Telephony.  The most common groups are: developing standards, H-Series, T-Series, and G-Series.  Furthermore, the most popular voice-over IP protocol is the H.323 protocol.  H.323 is a "standard" protocol for providing all sorts of interactive multimedia communication. It was originally designed primarily for video-conferencing, but it really consists of a complicated platform for all sorts of multimedia content.  Here is a link to a list of Protocols.