phone system
local calls

national long distance
national prefix: no prefix
area code: no area codes
number: --- ---
(always 6 digits)

example:

international calls
international prefix: 00
country code:
area code:
number:

exampe
calling from Congo
to Cybercafe de Paris
in Paris/France
00 33 I 422I IIII

usefull numbers
operator
Information
Fire
Police

calling from abroad
to Congo
+242  --- --- ( 6 digits after the country code)
example:
Cybercafe