Jon walks into the campus security office in his Telco costume and explains that he has been called out by the Local Exchange Carrier (LEC) because a circuit appears to be looped from the Telco.

Jon穿着他的电信制服走入场地安全办公室，然后说明他是由本地交换运营商(Local Exchange Carrier (lec))派来的，因为看来电路从电话公司形成了回路。

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Rules that a LEC (Local Exchange Carrier) employs to redirect a call that encounters a Busy or No Answer.

当呼叫遇忙或无应答时，LEC(本地电话公司)使用该规则重新发送呼叫。

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