Is there an international call in number I can offer to my client in Belgrade?
Hello,
Unfortunately at this time we do not have a number for Belgarde. You may provide an international number closest to their country, or they may download the FreeConferenceCall mobile app and dial in using “Wifi”.
Thank you. 
Our FreeConferenceCall service currently offers an international dial-in number in Serbia that your participants can use to connect to the call. Please note that even though they are dialing within their own country, we recommend they contact their provider to inquire about any charges.