Isdn Cause Codes - Polycom GlobalManagementSystem User Manual

Appendix

ISDN Cause Codes

Cause
Code
1
2
3
6
7
16
17
18
19
21
22
25
27
28
Global Management System User's Guide
Cause Description
Unassigned number
No route to specified transit
network
No route to destination
Channel unacceptable
Call awarded and delivered
Normal call clearing
User busy
No user responding
No answer from user (user
alerted)
Call rejected
Number changed
Non-selected user clearing
Destination out of order
Invalid number format
Definition
The switch received the sent ISDN number in the correct
format; however, no destination equipment uses the number.
The ISDN exchange cannot recognize the intermediate
network through which to route the call.
The intermediate network through which the call is routed does
not service the destination address.
The specified channel does not provide sufficient service
quality to accept the requested connection.
The user is assigned an incoming call that is being connected
to an already-established call channel.
Normal call clearing has occurred.
All B channels are in use; the called system acknowledges the
connection request, but is unable to accept the call.
The destination does not respond to the call so the connection
cannot be completed.
The destination fails to complete the connection within the
prescribed time after responding to the connection request.
The problem occurs at the remote end of the connection.
The destination rejects the call for an unknown reason,
although capable of accepting the call.
No system has been assigned the ISDN number used to set
up the call. (The diagnostic field of the message may return an
alternate address is assigned to the called equipment.)
The destination rejected the call, although capable of accepting
it, because the call was not assigned to the user.
A signaling message cannot be delivered because the interface
is not functioning correctly, and therefore the destination can
not be reached. This condition might be temporary, though of
extended duration; for instance, remote equipment might be
turned off.
Destination address presented in an unrecognizable format or
an incomplete destination address made the connection unable
to be established.
Appendix 149