une première tentative fut un echec mais celle-ci fonctionne:

"""""""
Another thing that might cause issues for some people if you are using standard extensions as static members is that the none of the extensions will get called after an asterisk restart until you reload the queue. This is due to the queue module being loaded before the dial plan and can be resolved by adding the lines below to your /etc/asterisk/modules.conf beneat the [modules] section.

load => pbx_config.so
load => chan_local.so
"""""""

merci à ce monsieur qui vient de régler le problème 1 de 3

on l'applaudit bien fort!