The Frame relay signalling table contains frame relay
signalling entries indexed by the frame relay access
channel circuit number. An instance of wfFrSwSigEntry
is required for each frame relay access channel with
frame relay signalling enabled. The absence of
wfFrSwSigEntry for a given frame relay access channel
implies that frame relay signalling is disabled for the
circuit. Note that the terms 'incoming' and 'outgoing'
refer to the frame mode call with respect to the network
side of the interface. The terminology used by CCITT
Q.933/Q.931 is different.