5.18.3.1. Identification With Master Number (Outgoing Seizure) 
Instead of the station number, the master number is sent to the remote
central office if:
- the station is blocked for direct inward dialing,
- the number is identified as 'Presentation restricted' (for example, a secret calling number),
- the A number is not available (for example, because of an analog network interface),
- the A number is identified as inadmissible (screening indicator: Screened but failed),
- the attendant console sets up the connection (does not apply to seizure of the line with the P aggregate).
You must configure the master number in MFCTA. If you have not configured
a calling number, the central office acknowledges the A number request
with the ID contents.
- Configure the master number as follows:
CHANGE-MFCTA:MFCVAR=x,TYPE=TBLF,OPT=FIDENT, BSDIRNO=master-number; CHANGE-MFCTA:MFCVAR=x,TYPE=TBLF,OPT=FIDENT, BSDIRCNT=number-of-digits-in-master-number;