Hi PAtrick I can see some errors in debug mode on asterisk problems with the audio: [Oct 15 01:17:05] WARNING[19906]: file.c:1396 ast_format_str_reduce: ignoring unknown format 'wav49' [Oct 15 01:17:05] WARNING[19906]: file.c:1396 ast_format_str_reduce: ignoring unknown format 'gsm' [Oct 15 01:17:05] WARNING[19906]: file.c:1396 ast_format_str_reduce: ignoring unknown format 'wav' [Oct 15 01:17:05] WARNING[19906]: file.c:1426 ast_format_str_reduce: no known formats found in format list (wav49|gsm|wav) [Oct 15 01:17:05] ERROR[19906]: app_voicemail.c:11702 load_config: Error processing format string, defaulting to format 'wav' I find in issues of Asterisk and i thing that this version is affected https://issues.asterisk.org/view.php?id=17709 I download the patch and solved the problem: wget 'https://issues.asterisk.org/file_download.php?file_id=26764&type=bug' -O - | patch -p0