Hey all, I’m trying to transfer my ivr system from bridge to conference for more function. The simple conference ivr likes: session:execute("pre_answer") session:execute("conference_set_auto_outcall", "user/" .. args.call_user) session:execute("conference", "testroom@default") My FreeSWITCH server is configured to accept only opus for audio codec, and it worked well on bridge mode. The uuid_dump showed: variable_rtp_use_codec_string: OPUS,H264,H263-1998,VP8 variable_rtp_use_codec_name: opus variable_rtp_use_codec_fmtp: useinbandfec%3D1 variable_rtp_use_codec_rate: 48000 variable_rtp_use_codec_ptime: 20 variable_rtp_use_codec_channels: 1 variable_rtp_last_audio_codec_string: opus%4048000h%4020i%401c variable_original_read_codec: opus variable_write_codec: opus variable_read_codec: opus But after I modified my ivr into conference, the read_codec turned into L16. Uuid_dump showed: variable_rtp_use_codec_string: OPUS,H264,H263-1998,VP8 variable_rtp_use_codec_name: opus variable_rtp_use_codec_fmtp: useinbandfec%3D1 variable_rtp_use_codec_rate: 48000 variable_rtp_use_codec_ptime: 20 variable_rtp_use_codec_channels: 1 variable_rtp_last_audio_codec_string: opus%4048000h%4020i%401c variable_original_read_codec: opus variable_write_codec: opus variable_read_codec: L16 Both tests are based on Linphone offical app. During test, the audio quality has a significant loss on conference mode compared with bridge, perhaps due to L16 codec. Is there any solutions for this situation? I wonder if I can disable L16 on my server, or force the codec to opus in conference. Any suggestion would be appreciated. Regards, C.Wang