Bridge an IP from LAN to WAN

[fvs]

Hi,
I'm new to OPNSense so maybe my question can be a dumb one.
I'm setting up an OPNSense firewall in my home lab and i have two different ISP; i already configured load balancing and it works fine, but now i need to connect a voip phone in the LAN that must be connected straight to one of the two WAN that i configured using VLAN 20.
Below the scheme:
WAN1 192.168.2.0 VLAN 20 -> OPNSENSE -> VOIP PHONE
WAN1 192.168.1.0 VLAN 1 -> OPNSENSE -> Client
WAN2 192.168.0.0 VLAN 1 -> OPNSENSE -> Client

The client are already working, i don't know how to setup the voip phone.
Thanks in advice to everyone who will spend time reading this thread.