Assume company A has local LAN 10.0.1.0/24 and company B has local LAN 10.0.2.0/24.
Also we assume that on both sides the other networks are already in use, e.g. in company A the network 10.0.2.0/24 is used for Voice and in company B network 10.0.1.0/24 is used for Guest Wifi.
Also we assume that on both sides the other networks are already in use, e.g. in company A the network 10.0.2.0/24 is used for Voice and in company B network 10.0.1.0/24 is used for Guest Wi-Fi.
We have to define new networks for the Phase 2 with unused ones and create NAT entries to reach the final systems.