I'm using 'allow_trusted()' from Permissions module without a problem in a Kamailio 4.0 routing logic. It does just work, but the MI command 'trusted_dump' tells me that the module is not in use:
server:/home/jmillan# kamctl fifo trusted_dump
500 Trusted-module not in use
'''
Doing a 'trusted_reload' does neither make any query to database to retrieve the data.
Other MI commands of same module do work correctly. ie: 'address_reload' or 'address_dump'
Note: I have tested in a Kamailio 1.5 and the result is the same.
Regards.
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José Luis Millán