Taiwan→Overseas: XXX-Country Code-Area Code-Phone Number
Foreign country→Taiwan: XXX-886-area code-phone number
 

For example:
To call from the U.S. to Asia University International College, please dial 011-886-4-2332-3456
011 (international transfer code for telecom operators). In Taiwan, the international transfer codes for telecom operators are (002, 005, 006, 016, 017)