This object is used to add or delete a dynamic dial path
in the PoolPreference list of a port. Each path and its
position in the list is represented as a row. When adding
a new path, only the createAndGo method of adding a row
is supported. All essential elements of the row must be
specified in the same SET request PDU. They are: the
path number(a3ComPortDialPoolPrefPathNum), the path position
(specified by the instance identifier associated with
a3ComPortDialPoolPrefPathPos) and the port number (specified
by the instance identifier associated with
a3ComPortDialPoolPrefPort).