This trap/inform is sent to the manager whenever a successful 
call clears, or a failed call attempt is determined to have 
ultimately failed. In the event that call retry is active, 
then this is after all retry attempts have failed. However, 
only one such trap is sent in between successful call
attempts; subsequent call attempts result in no trap.

This trap/inform is sent to the manager whenever a call 
connects, or  clears, or a failed call attempt is determined to 
have ultimately failed. In the event that call retry is active, 
then this is after all retry attempts have failed. However, 
only one such trap is sent in between successful call
attempts; subsequent call attempts result in no trap.
           
Whenever a call connects, demandNbrLastDuration, 
demandNbrClearReason, and demandNbrClearCode objects are not
included in the trap.

This trap/inform is sent to the manager whenever the
D-channel of an interface changes state.

This trap/inform is sent to the manager whenever the
an incoming call request is rejected with cause
'requested circuit/channel not available' (CNA),
code number 44.
          
isdnSignalingIfIndex is the ifIndex value of the interface
associated with this signaling channel.
          
ifIndex is the interface index of the requested bearer channel