This attribute specifies the transfer priority of frames sent to and
received from the ATM connection.
In the Frame Relay to ATM direction, the tp selects the FRF.5 End
Point which multiplexes the frames.
In the ATM to Frame Relay direction, the tp is applied to frames on
a per-DLCI basis.
This attribute is obsoleted. During migration, its value will be
transfered to the QualityOfService transferPriority.