| 摘要 |
An auxiliary ringer and call screener (ARCS) includes switches, a speaker, a reset button, an input jack, an output jack, and a power connecting jack interconnected with a housing, and ARCS circuitry mounted within the housing. The ARCS may also include an LED which illuminates when the ARCS emits an audible ring. An audible ring is produced through the speaker and a ring back tone is sent from the ARCS to a calling party to indicate that a proper sequence of DTMF codes from the call has been recognized and processed, when sequential incoming DTMF codes from a call from the calling party on the input jack match DTMF codes associated with settings of the switches. An audible ring is prevented from being emitted through the speaker, and a ring back tone is not sent back to the calling party when sequential incoming DTMF codes from the call on the input jack do not match the DTMF codes associated with settings of the switches.
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