The title cannot explain the situation, so here it is:
I have a multiWAN pfsense in the company's hq. I have installed some VoIP phones in a remote site. For the remote site I have a permit rule for WAN1 that permits their WAN IP to access one ERP server in our LAN.
Is this firewall rule blocking any attempt to access anything else from their WAN to our WAN1? (their VoIP phones cannot access our VoIP server from WAN1 -which has the permit rule for ERP- only from WAN2.