This attribute indicates the transfer priority in use for a specific
connection. This is the transfer priority that the local Frame Relay
network uses for this connection to an ATM network.
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 selects the default
FrAtm emission priority queue to be used by this Dlci.