DIRECT DISTANCE DIALING BLOCKING METHOD

摘要

The method is for alarming and prohibiting dialing when a zero input is detected after blocking direct distance dialing (DDD). The method comprises: (A) checking the blocking state when in a hook off state; (B) executing other service routine at no hook off and no blocking state, and (c) checking that the first input key is a first state; and (D) alarming and cancelling the input key when the input key is in the first state.