speech frame is 32.5 bytes, this implementation also defined a 33-byte nibble-padded representation of a GSM frame (which, at a frame rate of 50/s, is the basis for the incorrect claim that the GSM bit rate is 13.2 kbit/s). This codec can also be compiled into Wine to provide GSM audio support. There is also a Winamp plugin for raw GSM 06.10 based on the libgsm. The GSM 06.10 is also used in VoIP software, for example in Ekiga, QuteCom, Linphone, Asterisk (PBX), Ventrilo and others. See also Half Rate Enhanced Full Rate (EFR) Adaptive Multi-Rate (AMR) Adaptive Multi-Rate Wideband (AMR-WB) Extended Adaptive Multi-Rate - Wideband (AMR-WB+) Comparison of audio coding formats RTP audio video profile References External links RFC 3551 - RTP payload format for GSM (GSM 06.10) ETS 300 961 (GSM 06.10) - European Standard ETS 300 580-2 (GSM 06.10) - legacy specifications 3GPP TS06.10 - Technical Specification Libgsm homepage Audio codecs Speech codecs