> Recording Format: sfmts=wav49, prependfile /var/spool/asterisk/voicemail/default/1234/INBOX/msg0000-prepend, recordfile /var/spool/asterisk/voicemail/default/1234/INBOX/msg0000
[Nov 15 15:59:44] WARNING[23299]: file.c:831 ast_readfile: Unable to open /var/spool/asterisk/voicemail/default/1234/INBOX/msg0000.gsm
[Nov 15 15:59:44] WARNING[23299]: file.c:851 ast_readfile: No such format 'gsm'