CPC Disconnect generates a CPC disconnect signal on a PABX analog station (or any other line that does not provide this signal). Calling Party Control (CPC) signal is a momentary break in phone line loop current, which is used to signal automated telco equipment (ie. voice mail, call sequencers, etc.) the distant party has hung up.
CPC-1 CPC Disconnect Features:
Phone line powered (no AC needed)
Caller ID compatible
LED light shows when in use, audio detected, or generated CPC signal
Central office telephone lines typically provide CPC signal, but analog PABX stations do not
Generates a 1 second disconnect when it detects busy signal, reorder tones (fast busy), return to dial tone, or steady silence