This object defines the threshold value to accept only
PDP context with allocation/retention priority 1 when the
threshold is reached.
This object can be set only when cggsnUmtsQosCacMaxPdp is
set to some value and also the this object should have lesser
value that cggsnUmtsQosCacMaxPdp.
Value '0' means PDP context creation with allocation/retention
will not be checked.