Nellymoser Asao Codec FFmpeg (libavcodec) PictureTel PT716, PT716plus PictureTel PT724 RTAudio used by Microsoft Live Communication Server SVOPC used by Skype OpenLPC created by Future Dynamics HawkVoice (libHVDI) ANSI/SCTE ANSI/SCTE 24-21 2006 (BroadVoice16) BroadVoice Speech Codec Open Source C Code ANSI/SCTE 24-22 2013 (iLBCv2.0) ANSI/SCTE 24-23 2007 (BroadVoice32) BroadVoice Speech Codec Open Source C Code IETF RFCs: Internet Low Bit Rate Codec (iLBC, RFC 3951) developed by Global IP Solutions/Google WebRTC IETF Internet Draft SILK (used by Skype) CELT (developed by Xiph.Org Foundation) libcelt MPEG-4 Audio MPEG-4 CELP MPEG-4 HVXC Skyphone MPLP Inmarsat INMARSAT-M IMBE Inmarsat Mini-M AMBE Microsoft DirectPlay Those codecs are used by many PC games which use voice chats via Microsoft DirectPlay API. Voxware MetaVoice Windows Media Player (voxmvdec.ax) Truespeech Windows Media Player (tssoft32.acm) FFmpeg (decoder only) MS GSM Windows Media Player (msgsm32.acm) libgsm FFmpeg (decoder only) MS-ADPCM Windows Media Player (msadp32.acm) FFmpeg Digital Voice Recorder International Voice Association (IVA) standards: Digital Speech Standard / Standard Play (DSS-SP) FFmpeg (decoding only) Digital Speech Standard / Quality Play (DSS-QP) Sony LPEC Truespeech Triple Rate CODER (TRC) used in some pocket recorders Intermetall MI-SC4 - used by voice recorders such as RadioShack Digital Recorder and HyperHyde FFmpeg (decoder only) Mobile phone Generation 2 European Telecommunications Standards Institute (ETSI) GSM Full Rate (GSM 06.10, RPE-LTP) libgsm FFmpeg (decoder only) Half Rate (GSM 06.20, VSELP 5.6kbit/s) Enhanced Full Rate (GSM 06.60, ACELP 12.20kbit/s, compatible with AMR mode AMR_12.20) Telecommunications Industry Association (TIA) IS-95 (a.k.a. cdmaOne) IS-96A (QCELP 8kbit/s) IS-127 (EVRC 8kbit/s) IS-733 (QCELP 13kbit/s) Telecommunications Industry Association (TIA) IS-54/IS-136 (a.k.a. Digital AMPS) IS-85 (VSELP 8kbit/s) ITU-T G.191's IS-54 implementation IS-641 (ACELP 7.4kbit/s, compatible with AMR mode AMR_7.40) Association of Radio Industries and Businesses (ARIB) RCR STD-27 (PDC) PDC-HR (PSI-CELP 3.45kbit/s) PDC-FR (VSELP 11.2kbit/s) PDC-EFR CS-ACELP 8kbit/s (a.k.a. G.729) PDC-EFR ACELP 6.7kbit/s (compatible with AMR mode AMR_6.70) Generation 3/4 3rd Generation Partnership Project (3GPP) Adaptive Multi-Rate (AMR) AMR-NB 3GPP TS 26.073 AMR speech Codec (C-source code) reference implementation opencore-amr (one may compile ffmpeg with—enable-libopencore-amrnb to incorporate the OpenCORE lib) FFmpeg (by default decoder only, but see above the compiling options to incorporate the OpenCORE lib) AMR-WB 3GPP TS 26.173 AMR-WB speech Codec (C-source code) reference implementation opencore-amr (decoder), from OpenCORE (one may compile ffmpeg with—enable-libopencore-amrwb to incorporate the OpenCORE lib) vo-amrwbenc (encoder), from VisualOn, included in Android (one may compile ffmpeg with—enable-libvo-amrwbenc to incorporate the VisualOn lib) FFmpeg (by default decoder only,