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The term “High Definition” is traditionally applied to a technology when a new innovation allows a noticeable improvement in quality or detail from an existing version. The superior picture quality of an HD TV for example. The improvement in telephone audio quality that HD-Telephony offers is far less profound than that of HD-TV or HD-Radio but it’s an improvement nonetheless. The biggest issue with HD-Telephony is that the majority of phones and phone switches were designed with the mentality that every call they would encounter would be the same audio format and sampling rate.
