Country x OBi number is 200654321. In country x OBi110 set:
Physical Interfaces > PHONE Port > PrimaryLine: PSTN Line
Voice Service > Auto Attendant > PrimaryLine: PSTN Line
(These are the default settings)
Voice Services > OBiTALK Service > InboundCallRoute:
{(200123456)>(Mli):li},{(200123456):aa},{ph}
Country y OBi number is 200123456. In country y OBi set up a speed dial using the country x OBi number in this format pp(ob200654321) in this example I am using speed dial slot 3.
To dial from the OBi y phone and have the number go out via OBi x Line Port dial this format:
3*xxxxxxxxxxx
Where xxxxxxxxxxx is any number that matches the the Line Port Digit Map in the OBi110 in country x. (Single stage dialling).
If OBi y dials OBi x number 200654321 it will connect to OBi x auto attendant, which allows it access to OBI x's services. (Two stage dialling).
Some of the above can be set up using the OBi "Circle of Trust" method from your dashboard, but it is not so precise.
There are other ways of doing this. It depends on what the OBi in country y will be used for. The way I have described means that both OBi devices can be used independently as well as in their "master/slave" roles.
If the OBi110 is in France, then you might wish to learn some more about digit maps. The default digit maps are set up for North American number formats. If they are not configured to suit your local country, then dialling out can be very slow and clumsy. I know as I am in the UK and had to reconfigure some of my digit maps.