Trunk prefix

The term access code (abbreviated TSD, also remote access code, or excretion digit access code ) comes from the telecommunications and refers to the leading digits before the area code. Both together make the calling code.

Telephone systems

In telephone systems, an additional access code (typically an extra 0 in Germany ) needed to dial only from the internal to the external telephone network. Since only these external calls an outside line is required, the process outside line and then this additional VAZ Office access code (TAC ) is called. In American-dominated countries or even in designed for the international market the devices is often " 9 " is used as the TAC, as that is reserved in the United States mostly for the operator (switchboard) "0".

National

Since the standardization of international dialing codes by the International Telecommunication Union ( ITU), in many countries, the telephone area code for long distance calls from the national access code and the actual code number.

In a national telephone long distance call within the German telephone network, the telephone area code is composed of the prefix " 0" and the area code ( ONKZ ) together. The choice of the further VAZ connection is no longer controlled by the local exchange, but by the remote exchange. For example, results for Berlin with the ONKZ 30, the area code 030

Internationally

An international VAZ initiate an international call. In Germany, Austria, Switzerland and many other countries the national VAZ adds another 0, all international calls are initiated by "00". After selecting the international prefix of the other connection setup is controlled by the foreign exchange. Subsequently, the country code is selected, for example, Germany, the "49". Hence the entire code 0049 for Germany.

For the complete connection establishment, the area code and subscriber number are on international calls after the international access code and country code number is still required, however, the VAZ before the area code, usually falls away. Exceptions are Italy, Spain, Portugal and Luxembourg. Here is the code system was abolished altogether and there are only the subscriber number itself Therefore, a possible leading zero is part of the phone number and not considered as VAZ.

Spelling

When specifying numbers in the international business life shortens the international access code with " ", in particular because of different international VAZ be used. So which is usually in North America instead of "0", " 1 " is used as a national prefix and depending on the phone company several international access code (eg, " 011 ", " 00" or " 110"). For Germany to write so 49 (and not 49). For example, is the country code for international calls to Berlin 49 30