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Taking into consideration the fact that echo cancellation is really all about echo suppression and not echo prevention, you have probably already deduced that echo is extremely common in any telephony environment. Echo plagues VoIP systems due to their multiple sources of delay. It is therefore important to closely monitor the echo levels in a given VoIP system. Unless they use a mobile phone and expect at least slightly inferior service, users will complain stridently if echo becomes noticeable during their phone calls.
When monitoring echo levels in a phone system, or when troubleshooting a reported issue with echo, telecom professionals apply a well-known set of metrics that express the effectiveness of echo cancellation. These metrics also apply to VoIP.
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