(If you find progress and other non-error messages irritating, you can use -q to suppress them)
(You can use the -w option to dump extensions.conf format to extensions.conf.aeldump)
LOG: lev:2 file:pbx_ael.c line:115 func: pbx_load_module Starting AEL load process.
LOG: lev:2 file:pbx_ael.c line:128 func: pbx_load_module AEL load process: parsed config file name './extensions.ael'.
LOG: lev:2 file:pbx_ael.c line:131 func: pbx_load_module AEL load process: checked config file name './extensions.ael'.
LOG: lev:2 file:pbx_ael.c line:134 func: pbx_load_module AEL load process: compiled config file name './extensions.ael'.
LOG: lev:2 file:pbx_ael.c line:139 func: pbx_load_module AEL load process: merged config file name './extensions.ael'.
LOG: lev:2 file:pbx_ael.c line:142 func: pbx_load_module AEL load process: verified config file name './extensions.ael'.
LOG: lev:4 file:ael2_parse line:518 func: main 1 contexts, 7 extensions, 18 priorities