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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 ...
Automatic number announcement circuit, a machine which announces the caller's number [2] Loop around , a primitive conference call bridge [ 3 ] Milliwatt test , a standardized 1004 Hz, zero dBm sinusoidal test tone used to measure line quality and transmission loss between stations.
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 ...
The circuit has two associated phone numbers. When one side of the loop is called (side A), the caller receives a test tone of approximately 1000 Hz (milliwatt test). When the second number (side B) is called, it produces dead silence, but the party on side A hears the milliwatt test tone drop, and is connected to the person on side B.
All-number calling; Area code split; ... List of international call prefixes; International gateway; ... Plant test number; Area code 900;
So if your bank leaves a voicemail, don’t just call back the number from the missed call. Find the official number online and dial that, suggests Levin. “Never trust—always verify,” he says.
Subscribers may also dial +64 (8) 320-1231 from overseas to test if the (CPN) Caller ID number is being passed on to New Zealand; this should announce the area code and local number as it appears on call display.
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