Instruction manual

Page 1714 of 3156 Incoming DID Digit Conversion
553-3001-306 Standard 10.00 January 2002
Full Digit Conversion
All the digits received are converted to another string of digits as specified in
the conversion table.
Different strings of digits can be converted to the same internal Directory
Number (DN).
Partial Digit Conversion
Not all of the digits received from the Central Office (CO) are converted. The
remaining digits may remain unchanged, and the whole string of digits is
forwarded to the Directory Number (DN) translator.
It is possible to convert a partial string of digits to another partial string of
digits of a different length (for example, 23xx to 4xx or 2xx to 49xx). The
range of DNs to convert can include a mix of DN lengths.
No Digit Conversion
If the digits received are not defined in the conversion table, they are assumed
to represent an internal Directory Number (DN). They are forwarded to the
DN translator without any change.
An empty IDC table should not be programmed in a live DID route. If this is
done all calls to the DID route intercept to the attendant.
Direct Call Termination
Incoming calls from non-Direct Inward Dialing (DID) trunks are not affected
by Incoming DID Digit Conversion (IDC). If a call from a trunk on a route
with IDC is received, the digits are translated into a pass (continue) or a
converted telephone of local digits. These digits replace the dialed digits.
Additional dialed digits are then forwarded directly for call processing. The
IDC processor has no further influence on the call. Once the internal digit
processor receives the digits, it alone determines the disposition of the call. It
may be able to terminate the call, or it may be required to intercept the call
due to invalid digits, a busy station, or Call Forward.