Recommendation ITU-T G.107.1 gives the algorithm for the wideband version of the E-model as the common ITU‑T transmission rating model for planning speech services that provide wideband (WB) speech transmission (50-7000 Hz). This computational model can be useful to transmission planners, to help ensure that users will be satisfied with end-to-end transmission performance. The primary output of the model is a scalar rating of transmission quality. A major feature of this model is the use of transmission impairment factors that reflect the effects of different types of degradations occurring on the entire transmission path, mouth-to-ear.
This WB-E-model is an adapted version of the narrowband (300-3400 Hz) E-model, typically referred to as "the E-model", which is described in Recommendation ITU-T G.107. It does not replace the narrowband (NB) E-model. Instead, it describes a separate WB version of the model that uses, within limits, similar concepts and input parameters as the NB E-model.