Monday, 2 October 2017

TYPES OF BACKWARD SIGNAL
1. Dial Tone
2.Ringing Signal
3.Ringing Tone or Ring back Tone
4.Busy Tone signal
5. Number Unobtainable tone.
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TYPES OF BACKWARD SIGNAL 1. Dial Tone 2.Ringing Signal 3.Ringing Tone or Ring back Tone 4.Busy Tone signal 5. Number Unobtainable tone.

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