VoIP Echo - You Hear Me Now And Now And Now

The animated TECHTip Tutorial is available here.

This tutorial is on Echo, or, rather, EC [Echo Cancellation]. Echo is the reflection of the original back to the sender. There are many causes for echo but can occur in many types of network including SIP. SIP [Session Initiation Protocol] is a signaling protocol for internet conferencing, telephony, presence, events notification (emergency calling) and instant messaging.

Hybrid Echo is an impedance mismatches within the 2-wire to 4-wire (T-1) conversion called the Hybrid. Impedance is a measure (expressed in Ohms) of the opposition (resistance) to the flow of electricity and changes value as the frequency of the electricity changes. Capacitive reactance causes impedance to rise as the signal frequency decreases, whereas the inductive reactance causes impedance to rise as the frequency increases. That is, the higher the impedance, the lower the current.

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[tags]sip,techtionary,voip echo,hybrid echo,echo cancellation,ec[/tags]