Brian, I tested using originate {ignore_early_media=true,absolute_string=g729,ringback=/sounds/ somefile}sofia/default/1000 &bridge({ignore_early_media=true, ringback=/sounds/somefile,absolute_codec_string=g729}sofia/gateways/ xxxx/00000) To listen the ring back, you need set ignore_early_media, the ringback variable maybe not needed at A-leg To make codec g729 work, I commented one line in switch_g729_init in mod_g729.c: // codec->flags |= SWITCH_CODEC_FLAG_PASSTHROUGH; However, I need to carefully make sure no transcoding happens, see http://lists.freeswitch.org/pipermail/freeswitch-dev/2009-January/001750.htm...