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There are two forms of echoes on voice networks, Hybrid and Acoustic Echo. Hybrid echo is an electrical signal reflection that occurs at the 4 –wire to 2 – wire conversion point in a PSTN network. It is caused by impedance matching. It enters a VoIP network whenever there is a connection between PSTN and VoIP networks. Acoustic echo on the other hand is non – linear and is usually caused by poor acoustic isolation between the speaker and microphone of a device. It can gain entry into a VoIP network from any source. The major difference between the two types of echoes is that Hybrid echo is a property of the line connection and it remains mostly constant throughout the call while acoustic echo varies in latency depending on the environment of the echo source...
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