7.8.2.1.6. AMO KNPRE 
With the AMO KNPRE, a national or international (dialing) prefix can
be configured in the "Private" or "ISDN" numbering plan, depending on
the DPLN.
With the AMO GEFE, call data recording can be arranged so that the
recorded station numbers are supplemented by the corresponding prefix,
depending on the DPLN and numbering plan. This can be done separately
for internal (PREINT), incoming (PREINC), and outgoing (PREOUT), depending
on the connection type.
For example: DPLN 0, ISDN numbering plan, national prefix, access
code 6, dial 009
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ADD-KNPRE:DPLN=0,NPI=ISDN,TON=NATIONAL,EXIT=6,PREFIX=009;