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。
Rules that a LEC (Local Exchange Carrier) employs to redirect a call that encounters a Busy or No Answer.
无应答时呼叫的完成(CCNR)是一种向主叫用户提供的ISDN补充业务。
Completion of Calls on No Reply (CCNR) is an ISDN supplementary service offered to the calling user.
无应答时呼叫的完成(CCNR)是一种向主叫用户提供的ISDN补充业务。
Completion of Calls on No Reply (CCNR) is an ISDN supplementary service offered to the calling user.
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