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Appendix A-Disconnection Causes
A-10
ISDN Disconnection Causes
Table A-2 ISDN Disconnection Causes
Disconnection Cause
Number Summary Description
1 Unallocated
(unassigned
number)
No route to the number exists in the ISDN
network or the number was not found in the
routing table.
• Ensure that the number appears in the
routing table.
• Ensure that it is a valid number and that
correct digits were dialed.
2 No route to
specified transit
network
(national use)
The route specified (transit network) between
the two networks does not exist.
3 No route to
destination
No physical route to the destination number
exists although the dialed number is in the
routing plan.
• The PRI D-Channel is malfunctioning.
• Incorrect connection of the span or WAN.
4 Send special
information tone
Return the special information tone to the
calling party indicating that the called user
cannot be reached.
5 Misdialed trunk
prefix (national
use)
A trunk prefix has erroneously been included in
the called user number.
6 Channel
Unacceptable
The sending entity in the call does not accept
the channel most recently identified.
7 Call awarded
and being
delivered in an
Established
channel
The incoming call is being connected to a
channel previously established for similar calls.