1. 3GPP TS 126.445(2014).Codec for Enhanced Voice Services (EVS); Detailed algorithmic description 3GPP.
2. 3GPP TS 126.447(2014).Codec for Enhanced Voice Services (EVS; Error concealment of lost packets) 3GPP.
3. 3GPP TS 26.090(2001).Adaptive Multi‐Rate (AMR) Speech Codec; Transcoding Functions 3GPP.
4. 3GPP TS 26.190(2001).AMR Wideband Speech Codec; Transcoding Functions 3GPP.
5. 3GPP TS 26.290(2005).Extended Adaptive Multi‐Rate Wideband (AMR‐WB+) Codec 3GPP.