first, check that ur fax machine allows the international faxing facilities, through the manual you can verify it. if yes, along with ur country code followed by the fax dialling number faxing can be done.. for ex. fax to india:
Press the "9" key if you are faxing from an office that requires you to first dial a "9" to place an outside call. Press "011" for the international access code, then press "91" for India's country code. Press the city code for your recipient's fax machine. For example, the city code for Delhi is "11