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Signaling techniques enable the circuit to function as a whole by inter connecting all varieties of switching systems. There are three forms of signaling involved in a telecommunication network.

Subscriber loop signaling
Intraexchange or register signaling
Interexchange or inter-register signaling

The subscriber loop signaling depends upon the type of telephone instrument used. The intra exchange signaling refers to the internal portion of a switching system that is heavily dependent upon the type and design of a switching system, which varies depending upon the model. The inter-exchange signaling takes place between exchanges. This helps in the exchange of address digits, which pass from exchange to exchange on a link-by-link basis. The network-wide signaling that involves end-to-end signaling between the originating exchange and the terminating exchange is called the Line signaling.

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