Appendix F ISDN Information
ViewStation FX/VS 4000 User’s Guide 202 www.polycom.com
7
Call awarded and
delivered
The user is assigned an incoming call that is
being connected to an already-established call
channel.
16 Normal call clearing Normal call clearing has occurred.
17 User busy
All B channels are in use; the called system
acknowledges the connection request, but is
unable to accept the call.
18 No user responding
The destination does not respond to the call so
the connection cannot be completed.
19
No answer from user
(user alerted)
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.
21 Call rejected
The destination rejects the call for an unknown
reason, although capable of accepting the call.
22 Number changed
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
assigned to the called equipment.)
26
Non-selected user
clearing
The destination rejected the call, although
capable of accepting it, because the call was not
assigned to the user.
27 Destination out of order
A signaling message can not 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.
28 Invalid number format
Destination address presented in an
unrecognizable format or an incomplete
destination address prevented the connection
from being established.
29 Facility rejected
The network can not provide facility requested by
the user.
30
Response to STATUS
ENQUIRY
The prior receipt of a status inquiry message
generated the status message.
31 Normal, unspecified
A normal has occurred with no standard cause
applying. No resulting action is required.
34
No circuit/channel
available
The call can not be taken because no appropriate
channel is available to establish the connection.
(Continued)
Code Cause Definition
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