Isdn Disconnection Causes - Polycom RMX 1500 Administrator's Manual

ISDN Disconnection Causes

Table A-2
Number
Polycom, Inc.
ISDN Disconnection Causes
Summary
1 Unallocated
(unassigned number)
2 No route to specified
transit network
(national use)
3 No route to destination
4 Send special
information tone
5 Misdialed trunk prefix
(national use)
6 Channel Unacceptable
7 Call awarded and
being delivered in an
Established channel
8 Pre-Emption
9 Pre-Emption – Circuit
reserved for reuse
16 Normal Call Clearing
17 User Busy
18 No User Responding
19 No Answer from User
(User Alerted)
20 Subscriber Absent
21 Call Rejected
Disconnection Cause
Description
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.
The route specified (transit network) between the two
networks does not exist.
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.
Return the special information tone to the calling party
indicating that the called user cannot be reached.
A trunk prefix has erroneously been included in the called
user number.
The sending entity in the call does not accept the channel
most recently identified.
The incoming call is being connected to a channel previously
established for similar calls.
The call has been pre-empted.
Call is being cleared in response to user request.
Call cleared normally because user hung up.
Dialed number is busy.
The called user has not answered the call.
Called user has received call alert, but has not responded
within a prescribed period of time. Internal network timers
may initiate this disconnection.
User is temporarily absent from the network - as when a
mobile user logs off.
Called number is either busy or has compatibility issues.
Supplementary service constraints in the network may also
initiate the disconnection.
Appendix A-Disconnection Causes
A-7