Asterisk logging parameters defined in /etc/asterisk/logger.conf
So we need edit and save logger.conf
Sample config:
[general] [logfiles] console => notice,warning,error,dtmf messages => notice,warning,error ;verbose => notice,warning,error,verbose ;full => notice,warning,error,debug,verbose,fax
After save the file, you need to reload the logger:
asterisk -rx 'logger reload'