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Administrator’s Guide for ViewStation EX, ViewStation FX, and VS4000
C-2 www.polycom.com/videodocumentation
16 Normal call clearing The originator or receiver of the call has requested that
it be cleared.
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 equipment does not respond to the call,
so the connection cannot be completed.
19 No answer from user
(user alerted)
The destination equipment did not complete the
connection within the prescribed time after responding
to the connection request. The problem is at the remote
end of the connection.
21 Call rejected The destination equipment is capable of accepting the
call, but has rejected it for an unknown reason.
22 Number changed The ISDN number used to set up the call is no longer
valid. (The diagnostic field of the message may return
an alternate address assigned to the called equipment.)
26 Non-selected user
clearing
The destination is capable of accepting the call, but did
not assign it to the user.
27 Destination out of
order
A signaling message cannot be delivered because the
interface is not functioning correctly, and the destination
cannot be reached. This condition might be temporary;
for example, remote equipment might be turned off.
28 Invalid number
format
Destination address was incomplete or presented in an
unrecognizable format, which prevented the connection
from being established.
29 Facility rejected The network cannot provide the facility requested by the
user.
30 Response to
STATUS INQUIRY
The equipment returns this message when it receives a
STATUS INQUIRY message.
31 Normal, unspecified A normal event has occurred with no standard cause
applying. No resulting action is required.
34 No circuit/channel
available
The call cannot be taken because no appropriate
channel is available to establish the connection.
38 Network out of order A network problem prevented the call from reaching its
destination. Attempts to reconnect will probably fail until
the network problem is corrected.
41 Temporary failure A network error occurred. The problem will be resolved
shortly. Attempts to reconnect may succeed.
42 Switching equipment
congestion
The destination cannot be reached because the
network switching equipment is temporarily overloaded.
Code Cause Definition