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__NOTOC__ Area code 613 and overlay area code 343 are area codes for Ottawa and surrounding Eastern Ontario, Canada, in the North American Numbering Plan (NANP). 613 is one of the 86 original area codes in the NANP assigned in October 1947. == History == The 613 area originally covered all of Ontario with the exception of the Golden Horseshoe, which was in area code 416. The area code has been split twice. In 1953, the Southwestern Ontario portion of 613 was combined with the western portion of 416 to become 519. In 1957 the vast northwestern portion of 613 was combined with the northern portion of 519 to become area code 705. Since 1957, 613 covers only Eastern Ontario, an area extending from Brighton and Deep River eastward to Saint Regis, Quebec. Ottawa and its twin city in Quebec, Hull fall on the boundary between 613 and Quebec's area code 819. However, they share the same local calling area. As a result, local calls could be completed between Ottawa and Hull without dialling an area code. A similar situation prevailed in the Washington metropolitan area across three jurisdictions--Washington itself and parts of Maryland and Virginia. While there are fewer than two million people in the geographic area covered by 613, the bulk of that population lives in the Ottawa area. To preserve seven-digit dialling between Ottawa and Hull, an exchange code protection scheme was implemented so that the same seven-digit local number could not be assigned on both sides of the National Capital Region. Technically, it was only necessary that no two prefixes within the same local calling area be duplicates, but the code protection as implemented reserved the numbers across an entire area code. This meant that if a 1-819 number was being used in Hull, the corresponding 1-613 number could not be used anywhere in eastern Ontario, even in areas a safe distance from the National Capital Region such as Brighton. Similarly, if a 1-613 number was being used in Ottawa-Carleton, the corresponding 1-819 number could not be used anywhere in western Quebec. Federal government offices in Hull duplicated their entire allocation of multiple exchanges worth of numbers available in 613 as part of a "dual dialability" scheme. The problems were aggravated by Canada's inefficient number allocation system. With no number pooling in Canada, every competitive local exchange carrier received blocks of 10,000 numbers in every rate centre in which they planned to offer local service. A tiny unincorporated village (like Odessa, Ontario, with no telephone central office but still listed as a rate centre) usually received multiple 10,000 number blocks. Larger municipalities have multiple rate centres and multiple competing carriers in each. Ottawa, now one municipality, has 11 rate centres - most with very similar local calling areas - which were never amalgamated. The "Ottawa-Hull" exchange only covers the area that was the city of Ottawa prior to the 2001 amalgamation, plus the former suburbs of Nepean and Vanier. Once a number is assigned to a rate centre and CLEC, it is unavailable for use elsewhere, even in cases when a rate centre has more numbers than it needs. These factors not only resulted in thousands of wasted numbers, but also led to the premature depletion of prefixes. By 2006, the only remaining unassigned exchange prefixes in the entire 819 region were numbers which could not be assigned to the Quebec side of the Ottawa-Hull area without breaking seven-digit dialling between Hull and Ottawa. Ten-digit dialling in 613 and 819 became mandatory on October 21, 2006. Intraprovincial calls from points with no local calling beyond a small fragment of their own area code were returning intercept messages if dialled as seven digits. Exchange protection in the National Capital Region was ended, except for the "dual dialability" scheme for government numbers in 819.〔http://www.localcallingguide.com/lca_prefix.php?switch=HULLPQ20CG1 lists (613) 934, 939, 953, 956, 994 and 997 and the matching numbers in (819).〕 The inefficient assignment of numbers continued, along with the proliferation of cell phones and multiple carriers. Within two years, it became apparent that a new area code was necessary. As telephone companies were opposed to geographically splitting area codes, wishing to spare themselves the burden of changing existing clients' numbers and ''en masse'' reprogramming of cell phones, distributed overlay area codes were proposed for both 613 and 819. Area code 343, an overlay proposed in 2007〔http://www.cnac.ca/npa_codes/relief/613/documents/Draft_NPA_613_PD_4_DEC_2007.doc〕 and approved by the Canadian Radio-television and Telecommunications Commission on September 10, 2008,〔(Telecom Decision CRTC 2008-89 )〕 was activated for the region on May 17, 2010,〔(【引用サイトリンク】title=Area Codes for Ottawa, Ontario )〕 several years earlier than originally anticipated.〔(Hey, Ottawa, we've got your number: 343 ), Ottawa Citizen〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Area codes 613 and 343」の詳細全文を読む スポンサード リンク
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