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A trunk call is prefixed with '0' for national calls and '00' for international calls, following the European standard. It is now normal for local calls to cost the same as long-distance UK calls, and is now common, for a small extra monthly charge, to allow free calls to landlines within the UK.
International telephone calls are those made between different countries. These telephone calls are processed by international gateway exchanges (switches). Charges for these calls were high initially but declined greatly during the 20th century due to advances in technology liberalization. Originally they were placed via long-distance operators.
A call to London in the UK, would require the international access code and country calling code, as follows: 011 44 20 xxxx xxxx. In the North American Numbering Plan, 011 is used as the international access code, but in most countries, 00 is used, in line with International Telecommunication Union's Recommendation E.164.
A carrier receives calls in country A, turns them into IP packets using an IP gateway device and sends them over an IP connection (public or dedicated) to another carrier or ISP in country B, which re-assembles the voice call and sends it out from a PBX. The cost is composed of the cost to convert the call, IP connectivity, convert the call back.
Worldwide distribution of country calling codes. Regions are coloured by first digit. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.
This is a list of international dialing prefixes used in various countries for direct dialing of international telephone calls.These prefixes are typically required only when dialling from a landline, while in GSM-compliant mobile phone (cell phone) systems, the symbol + before the country code may be used irrespective of where the telephone is used at that moment; the network operator ...