The combination of this object and the corresponding instance of
csfFilterCalledParty is one selection criteria for this
record. To match this selection criteria, a failed connection
setup must have a Calling Party Address which equals the value
of csfFilterCalledParty for all bit positions identified
by the value of csfFilterCalledPartyMask. If the mask
value is shorter than the length of csfFilterCalledParty,
then it is extended with zero bits to be the required length. If
the default value for this object is retained then the rejected
call will match this filtering criterion if and only if the
calling address in the call matches the
csfFilterCallingParty for this entry.