Connecting Function

(1)When the calling party lifts the handset, the exchange detects this off-hook condition and identifies the caller.

(2)The exchange returns a dial tone to the calling phone.

(3)The exchange receives and stores the called party's telephone number sent from the calling phone.

(4)The exchange sends the stored telephone number to the translator to convert it to information required for connecting the call and identify the location where the called phone has been accommodated.

(5)The exchange sends a ringing tone to the called phone while returning a ring-back tone to the calling phone.

(6)When the called party lifts the handset, the exchange detects the off-hook condition and connects the calling phone to the called one.

(7)When either party hangs up the handset, the exchange detects the on-hook condition and disconnects the call to restore the phone to the original state.