Stages of an Inter-exchange Call Processing
An inter-exchange call is switched between two switching systems. There are five main stages of processing an inter-exchange call. Call Origination begins when the caller first picks up the telephone handset and completes a circuit to the local exchange. Digit Analysis is done during this stage where dialed digits are received and the originating exchange determines how to route the call to the local exchange of the called line.
Ringing during this stage, a path is established between the originating and terminating exchanges. A ringing signal is sent to the called line and an audible ring is sent to the calling party. Talking begins when the called line is answered. A talking connection is established between two telephone lines so that conversation can take place. Disconnection happens when one of the lines changes to on-hook. The talking path between the two lines is released.
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