I have a RUTXR1 with an WAN (static) IP and a backup SIM.
Connected to the RUT are VoIP PBX and phones.They need Internetaccess and the "normal services" like ntp, http(s), sip etc.
In the LAN there ist IP .200 another Router for the customer network (server, clients, etc). All incoming data should go to these router .200 to do vpn etc.
I read that I shoud configure firewall - portforewaring and leave the Port empty, but then an error occours.
What would be the best way? Are there any problems that, for example, my sip-ports go to the .200 and not back to my pbx?