Jeetco,
With the help from Stewart, your friend in Romania can make phone calls to other places via OBi110, the method will depend on the stability of that system. I believe your problem is your friend phone number could not be shown on your friend's office obi110. I would like to help you in exploring this issue if you like.
Please use an ordinary phone that is able to show incoming caller's ID and connect the telephone line of your friend's office. If the telephone could show the the caller ID whenever your friend calls in, then the problem is the Obi110, which has not been properly set based on your local Romania telco PSTN requirement.
YH