Preemption/ Prefix 0 dialed in error (NI-2: National ISDN 2)/ Call identity in use (1TR6: AT&T ISDN Protocol)/ Call is proceeding (NI-1: National ISDN 1)
Cause
Cause value 8 that for Autovon switching networks, a call with a higher priority blocks the call attempt.
Cause value 08 (NI-2) indicates that the remote user need not include prefix 0 as part of the digit string in the CALLED PARTY NUMBER.
Cause value 08 (1TR6) indicates that the call identity that is sent in the call resume request is already in use by the network.
