In some networks, it is difficult (even impossible) to ever connect to the default IP 192.168.5.150 that new Yeastar PBX seem to ship with.
New PBX should be rolled out with an active DHCP client, and only when DHCP requests fail (e.g. because the network has no DHCP server), should it default to 192.168.5.150.
During the initial setup, the admin should be able to set a new static IP (like today).
This would speed up the setup greatly in environments where the network is non-trivial.