Hi, here is a short summary of my configuration and issue: 1. Pi-4 with Raspbian buster and latest related FreeSwitch distribution, apt-upgraded and updated on last Friday 2. aplay is working both with the audio jack and with bluetooth (although not simultaneously: as soon as I have a bluetooth audio connection, the audio jack stops to work, and I cannot switch back to it with "amixer cset numid=3 1", but aplay can continue to use the bluetooth connection again after I issue "amixer cset numid=3 65536") 3. It seems that I do not have any permission issues as both of the users pi and freeswitch are in the audio group, which has rw access to the related devices under /dev/snd 4. I have already installed alsaoss, libasound2 and libasound2-dev 5. The output of "pa rescan" in fs_cli is the following: 2020-06-19 06:55:18.803478 [INFO] mod_portaudio.c:3186 Looking for new devices. 2020-06-19 06:55:18.803478 [INFO] mod_portaudio.c:2102 PortAudio version number = 1246720 PortAudio version text = 'PortAudio V19.6.0-devel, revision 396fe4b6699ae929d3a685b3ef8a7e97396139a4' 2020-06-19 06:55:18.943433 [DEBUG] mod_portaudio.c:1773 global indev [-1] 2020-06-19 06:55:18.943433 [ERR] mod_portaudio.c:1777 Cannot find an input device 2020-06-19 06:55:18.943433 [DEBUG] mod_portaudio.c:1786 global outdev [-1] 2020-06-19 06:55:18.943433 [ERR] mod_portaudio.c:1790 Cannot find an output device 2020-06-19 06:55:18.943433 [INFO] mod_portaudio.c:2125 Number of devices = 0 Any clue, what could be wrong on my side? Thanks! -- Saied