EVRC-D is defined in 3GPP2 C.S0014-D: Enhanced Variable Rate Codec, Speech Service Option 3, 68, 70 and 73 for Wideband Spread Spectrum Digital Systems.

EVRC-D consists of EVRC-A, EVRC-B, EVRC-WB and EVRC-NW.

EVRC-NW is a narrowband-wideband Enhanced Variable Rate Codec, corresponding to speech service option 73, combining the wideband capability of EVRC-WB, the multiple-capacity operating point capability of EVRC-B, and capability for discontinuous transmission in circuit-switch domain.

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