Just curious, Any chance of using amr for asterisk? http://en.wikipedia.org/wiki/Adaptive_Multi-Rate_audio_codec The codecs (both wb and nb) seems to be available at packman: http://ftp5.gwdg.de/pub/linux/misc/packman/suse/11.2/src/amrnb-7.0.0.2-0.pm.5.1.src.rpm http://ftp5.gwdg.de/pub/linux/misc/packman/suse/11.2/src/amrwb-7.0.0.3-0.pm.5.1.src.rpm hw