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The test consists of calling a reverting calling telephone number (ringback number) or a vertical service code with a standard telephone. Upon answering the call, the exchange plays a unique signal tone as a signal for the installer to hangup the telephone. The exchange then places a reverting call to the originating line, causing the telephone ...
Number Purpose 999 or 112: Emergency services 13xxx: Carrier preselect codes 1471: Last-call return: 171: Mobile and fixed line voicemail: 172, 173, 174X and 179: Reserved for network use 1901 to 1999: Helpline / customer service numbers for telecommunications companies. All are free of charge. 199000: Identifies current number on OpenEir PSTN ...
The general public tends to refer to the service by the telephone feature code, the telephone number it has in their country; for example, in North America, this is *69, while in the UK, it is called 1471. The New York Times described Call Return in 1992 as a new service. [1] It can be paid for per-call or subscribed to monthly. [1
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By connecting a test telephone set, a technician calls the local telephone number of the automatic number announcement service. This call is connected to equipment at the central office that uses automatic equipment to announce the telephone number of the line calling in. The main purpose of this system is to allow telephone company technicians ...
Although Northern Ireland is part of the UK numbering plan, a special arrangement exists for calling Northern Irish landlines from the Republic of Ireland. Calls to Northern Ireland can be dialled using the 048 prefix or by dialling the number in the full international format. Most Irish operators treat calls to Northern Ireland at national or ...