After banging my head on the table, i called the shoots to go back to RTF: https://www.juniper.net/documentation/en_US/junos/topics/concept/firewall-filter-ex-series-packet-understanding.html
and the error became clear. It must be in output filter on the Vlan and not input.
Altering from:
vlan-id 12; l3-interface irb.12; forwarding-options { filter {input VoIP; } dhcp-security; }
to
vlan-id 12; l3-interface irb.12; forwarding-options { filter {output VoIP; } dhcp-security; }
while keeping your adviced ARP term, all is working (without it is not working).
Thank you so much, this I would had never done