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VoIP Theory

VoIP IP network

VoIP encapsulates audio via a codec into data packets, transmits them across an IP network and decapsulates them back into audio at the other end of the connection. VoIP endpoints include applications running on mobile devices and PCs or dedicated desktop VoIP phones. VoIP endpoints typically use codecs, such as G.711, this does transmit uncompressed packets, or G.729, which does compressed packets which reduce bandwidth requirements. VoIP typically supports non-voice communications via the ITU T.38 protocol for sending faxes over VoIP.