I have never tried any of the linux audio drivers, but I have never heard a good word about any of them. YMMV. In ${conf_dir}/autoload_configs/portaudio.conf.xml I see: <settings> <!-- indev, outdev, ringdev: partial case sensitive string match on something in the name or the device number prefixed with # eg "#1" (or blank for default) --> <!-- device to use for input --> <param name="indev" value=""/> <!-- device to use for output --> <param name="outdev" value=""/> The wiki has some good ideas on how to list the available devices from fs_cli in: https://freeswitch.org/confluence/display/FREESWITCH/mod_portaudio One suggestion to aid you in testing would be to use the “playback” dialplan app to generate test tones with tone_stream or play a .wav file. --- Bote Man Bote Communications From: FreeSWITCH-users <freeswitch-users-bounces@lists.freeswitch.org> On Behalf Of Steven Schoch Sent: Sunday, 28 March, 2021 00:18 To: freeswitch-users <freeswitch-users@lists.freeswitch.org> Subject: [Freeswitch-users] Configuring mod_portaudio for Debian built-in (JACK?) audio I have an HP Prodesk tower with Debian and FreeSWITCH installed. It has an audio jack that is plugged into a speaker. I configured the system so that the devices in /dev/snd are group "freeswitch". Now I want to transfer a call to the speaker with <action application="bridge" data="portaudio/auto_answer"/>. However, I am getting errors when I load mod_portaudio that look like this: 2021-03-27 21:15:30.747447 [ERR] mod_portaudio.c:1617 Invalid outstream specified for endpoint 'default' It looks like a config file issue, but I have no clue where to start because I couldn't find a good example. Any suggestions? -- Steve