That is dependent upon the option bit in your API frame or the TO command for the transparent nodes. If you are set for Mesh mode, than yes they will act as a routers.
But this series is far-reaching, as the Pro series
If not is possible I’ll have to use one of the XBee Pro 868 modules with a high gain antenna (directional) connected to a GSM module to transmit data via the Internet.
Not mvut but you are correct. The 868 Pro can only do point to multipoint. No routing or hops. You could build a device that had two 868 Pro’s that was effectively a repeater.
Please note the 868 Pro has been end of lifed and should not be used in any new designs. All new designs should be focused on the 868LP.