This object denotes the maximum number of SGSN changes that
will trigger the closure of G-CDR or partial record. When the
maximum number is reached, the record is closed and a new
partial record is opened. When the value is zero, then for
every SGSN change, the G-CDR or partial record is closed.
If the value of object is set to '-1', then the number of
SGSN changes is not associated with the closure of G-CDR
or creation/closure of partial record.