The country code ( CC) is the international code for a specific country. For international telephone numbers, two zeros (00) are dialed before the country code, this is the international traffic prefix(VAZ). The country code is followed by the area code(ONKz), the subscriber number( SN) and possibly a number for the extension.
If you are within a country network, you do not need to dial the traffic separation code and the country code. The situation is different when calling abroad or from abroad, in which case the country code for Germany must be dialed after the international traffic access code (00). This is different for each country and can have one, two or three digits.
For Germany, the country code is 49, for Austria 43, for the USA 1, for Liechtenstein 423, etc.
The country code is defined in the ITU-T standards E.163 and E.164 and describes the international dialing codes of a country. In mobile networks, the country code is used to identify the country in which the mobile station is registered.