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protocol for this stream are defined by SDP (Session Description Protocol). SIP is a peerto-peer protocol but it requires simple network infrastructure with some intelligence in the endpoints. [21] 3.8 Voice Activity Detection: This is a feature in VoIP that stops sending traffic during silence. This means it saves our bandwidth. On average, phone calls are about 35% silence, though it really does depend on the call types, and also languages matter in VAD. Background noise decreases the efficiency of VAD, and it does not work with MOH (Music on Hold). 16
