Hi, I compiled pjsip on my Debian Stretch virtual machine (it's a virtual machine without any soundcard) and I tried to make a simple call using the command /usr/local/bin/pjsua --config-file=pjsua.conf sip:01234567@sip.pbx.local and it works. But if I try to play an audio file the call does not start and I receive the following error: pjsua_aud.c .Unable to open file for playback: Unsupported WAVE file format (PJMEDIA_EWAVEUNSUPP) [status=220181] Below there is the full output with the full executed command: /usr/local/bin/pjsua --config-file pjsua.conf --play-file /tmp/alert.wav --auto-play --duration 20 --max-calls 1 sip:01234567 18:53:33.389 os_core_unix.c !pjlib 2.8 for POSIX initialized 18:53:33.390 sip_endpoint.c .Creating endpoint instance... 18:53:33.390 pjlib .select() I/O Queue created (0x55e9fcb7eba0) 18:53:33.390 sip_endpoint.c .Module "mod-msg-print" registered 18:53:33.390 sip_transport.c .Transport manager created. 18:53:33.391 pjsua_core.c .PJSUA state changed: NULL --> CREATED 18:53:33.391 sip_endpoint.c .Module "mod-pjsua-log" registered 18:53:33.391 sip_endpoint.c .Module "mod-tsx-layer" registered 18:53:33.391 sip_endpoint.c .Module "mod-stateful-util" registered 18:53:33.391 sip_endpoint.c .Module "mod-ua" registered 18:53:33.391 sip_endpoint.c .Module "mod-100rel" registered 18:53:33.391 sip_endpoint.c .Module "mod-pjsua" registered 18:53:33.391 sip_endpoint.c .Module "mod-invite" registered 18:53:33.392 pjlib ..select() I/O Queue created (0x55e9fcb8d088) 18:53:33.398 sip_endpoint.c .Module "mod-evsub" registered 18:53:33.398 sip_endpoint.c .Module "mod-presence" registered 18:53:33.398 sip_endpoint.c .Module "mod-mwi" registered 18:53:33.398 sip_endpoint.c .Module "mod-refer" registered 18:53:33.398 sip_endpoint.c .Module "mod-pjsua-pres" registered 18:53:33.398 sip_endpoint.c .Module "mod-pjsua-im" registered 18:53:33.398 sip_endpoint.c .Module "mod-pjsua-options" registered 18:53:33.398 pjsua_core.c .1 SIP worker threads created 18:53:33.398 pjsua_core.c .pjsua version 2.8 for Linux-4.9.0.7/x86_64/glibc-2.24 initialized 18:53:33.398 pjsua_core.c .PJSUA state changed: CREATED --> INIT 18:53:33.398 sip_endpoint.c Module "mod-default-handler" registered 18:53:33.398 pjsua_aud.c Creating file player: /tmp/alert.wav.. 18:53:33.398 pjsua_aud.c .Unable to open file for playback: Unsupported WAVE file format (PJMEDIA_EWAVEUNSUPP) [status=220181] 18:53:33.398 pjsua_core.c Shutting down, flags=0... 18:53:33.398 pjsua_core.c PJSUA state changed: INIT --> CLOSING 18:53:33.409 pjsua_call.c .Hangup all calls.. 18:53:33.409 pjsua_media.c .Call 0: deinitializing media.. 18:53:33.409 pjsua_pres.c .Shutting down presence.. 18:53:34.412 pjsua_core.c .Destroying... 18:53:34.412 pjsua_media.c .Shutting down media.. 18:53:34.893 sip_transaction.c .Stopping transaction layer module 18:53:34.893 sip_transaction.c .Stopped transaction layer module 18:53:34.894 sip_endpoint.c .Module "mod-default-handler" unregistered 18:53:34.894 sip_endpoint.c .Module "mod-pjsua-options" unregistered 18:53:34.894 sip_endpoint.c .Module "mod-pjsua-im" unregistered 18:53:34.894 sip_endpoint.c .Module "mod-pjsua-pres" unregistered 18:53:34.894 sip_endpoint.c .Module "mod-pjsua" unregistered 18:53:34.894 sip_endpoint.c .Module "mod-stateful-util" unregistered 18:53:34.894 sip_endpoint.c .Module "mod-refer" unregistered 18:53:34.894 sip_endpoint.c .Module "mod-mwi" unregistered 18:53:34.894 sip_endpoint.c .Module "mod-presence" unregistered 18:53:34.894 sip_endpoint.c .Module "mod-evsub" unregistered 18:53:34.894 sip_endpoint.c .Module "mod-invite" unregistered 18:53:34.894 sip_endpoint.c .Module "mod-100rel" unregistered 18:53:34.894 sip_endpoint.c .Module "mod-ua" unregistered 18:53:34.894 sip_transaction.c .Transaction layer module destroyed 18:53:34.894 sip_endpoint.c .Module "mod-tsx-layer" unregistered 18:53:34.894 sip_endpoint.c .Module "mod-msg-print" unregistered 18:53:34.894 sip_endpoint.c .Module "mod-pjsua-log" unregistered 18:53:34.894 sip_endpoint.c .Endpoint 0x55e9fcb73e08 destroyed 18:53:34.894 pjsua_core.c .PJSUA state changed: CLOSING --> NULL 18:53:34.894 pjsua_core.c .PJSUA destroyed... Could you help me to find out where I am wrong, please? Thank you very much! Bye