How to access other devices in vpn server's lan?

[vpninda]

Hello I set up the ovpn connection and I'm able to connect remotely to my NAS for accessing files and I can even log into the NAS admin web interface through OpenVPN Connect client.
However I can't connect to the web interfaces of other devices in the NAS network through the VPN.
That is, I can access the NAS web interface by entering https://10.8.0.1/ in the web browser, but it looks like I cannot access the web interfaces of the other devices in the same network of the NAS (a router and a voip telephone exchange).
Which IP addresses should I enter for connecting to those devices? Server's LAN has IP addresses in the range: 192.168.1.x but entering https://192.168.1.1/ (the router) or 192.168.1.100 (the telephone exchange) seems to get no response, so I guess my browser still tries to connect to my pc lan local resource instead of going through the vpn (unfortunately client's lan ip range is also the same of the server lan: 192.168.1.x ).
I guess I should add some custom commands in the OpenVPN Connect profile configuration file (route...? ipconfig...? or something similar...) for replacing references to local devices with the remote (server lan) devices, but have no idea what.