This is the incoming call screening table
for the FRSW over ISDN application. The table
consists of a FRSW UNI Index and a list of allowable
ISDN Phone numbers for that FRSW UNI Index.
The table is indexed by both the FRSW UNI Index
and the ISDN Phone Number.
This table is referenced only when the
wfFrSwIsdnAssocScrnEnable is set to
Enabled for this FRSW UNI Index.