Avaya IP500 4 Line Trunk Card (Comcode 700417405)

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·Connects to IP500 base card - When connected to IP500 base card, it provides 4 loop-start analog trunk ports
·Also provides DTMF, caller ID (ICLID), busy tone detection
·Adjustable echo cancellation - Selectable to Off, 8, 16, 32, 64, and 128 milliseconds
·Power Failure Transfer - When fitted to an IP500 analog phone base card.  During power failure, the first extension port (port 1) is connected to the first analog trunk (port 9)
·Maximum -  4 per IP500 control unit