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I figured we should start a list of countries that still use CCITT5 for international calls. It would be cool to get a list of country codes and prefixes. For testing this stuff I recommend using Blue Beep on DosBox, which is available from Text Files via the Wikipedia article. Use the one with the source code, as its more up to date. Check out this text file Blue Boxing in the Late 90s for more information on how this stuff works. The CIA World Factbook has information on the phone systems in use in every country in the world. World Factbook Numbers I have found so far that use it in some form: United States Toll Free International Direct Numbers 866-284-3437 - C5 Trunk to Malaysia (maybe) 888-647-6843 - C5 Trunk to Argentina via Sprint 877-655-0054 - C5 Trunk to Argentina via AT&T 877-278-9344 - C5 Trunk to Argenina via MCI