17.3. AICF - ATND intercept if the call is identified as forwarded 
Feature:
Call forwarding to central office, intercept to ATND
Function:
An incoming call via an MFC trunk that is identified as forwarded is not forwarded
to the
central office, but intercepted to the ATND if the COT parameters MFC and AICF are
set for
the incoming busy MFC trunk. If, on the other hand, COT parameter MFC is set and COT
parameter AICF is not set, then the incoming call is canceled with a congestion signal
if a
forwarded incoming call is to be routed to the central office on the basis of call
forwarding.
Device types:
Analog trunks with MFC signaling, e.g. ICF, ICLCH, ICLLP, ICLFB, ICLIB
Protocol variants:
ANALOG Protocols for analog trunks