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In the United Kingdom a Migration Authorisation Code (MAC) was a 17 to 19-character unique identifier code used by DSL customers when they wish to switch internet service provider (ISP). A MAC is generated by the actual telecommunication provider (most commonly BT), identifies the local loop (telephone line) to be switched, and authorises the provider to switch the customer to the new ISP. MACs usually begin with "BBIP", "FTIP", "BBDS", or "BBDP", and consist of 4 letters, 7 digits (sometimes up to 9), a slash, 2 letters, 2 digits (this indicates the day in the month the MAC was issued), and 1 final letter. (For example: BBIP87654321/AB12C).〔http://www.plus.net/support/customer_service/using/request_mac_key.shtml#1〕 ==Background== After a request for a MAC it should be provided by the ISP within five working days. MACs are valid for 30 days once issued, providing the customer with the opportunity of switching ISPs within that period. It usually takes around three to ten working days for accounts to be switched over from one ISP to another.〔http://www.talktalk.co.uk/talktalk/servlet/gben-server-PageServer?article=MAIN.UK.TALKTALK.STATIC.HELP.BBHELP.MACCODE〕 The code was first introduced by Ofcom and BT as a voluntary code of practice. However, as of 14 February 2007, the rule became compulsory (General Condition No. 22: Service Migrations). This meant that if a broadband customer requested a MAC from their ISP then the provider ''must'' supply one free of charge.〔http://news.zdnet.co.uk/communications/0,1000000085,39285135,00.htm〕 The rules were implemented in order to ease the process of switching ISPs. Switching customers will usually only lose their Internet connection for up to a few hours during the migration. As of 20 June 2015 the MAC code is no longer required to enable switching of ISPs.〔http://media.ofcom.org.uk/news/2015/easier-bb-switching/〕 A customer who wishes to change broadband provider now only needs to request the service from the gaining provider. 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「Migration Authorisation Code」の詳細全文を読む スポンサード リンク
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