I need to conect a LAN '192.168.1.100' to a '192.168.2.100' through the router using phone lines without Internet. Can this device connect via phone lines to another RF102 and establish a conection with router administration?

Yes, you can connect RF102S to each other without Internet and it will provide standard routing between two subnets over the phone line.

Here is a link to our "rf102 lan-to-lan routing doc":

https://webfiles.multitech.com/resolutions/documents/routefinder/