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Appendix D ISDN Information
ViewStation User Guide 206 www.polycom.com
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
cannot 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 cannot 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 error code 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 The network is not functioning correctly
and this condition may persist for an
extended period. The call cannot reach the
destination and an immediate attempt to
reconnect fails.
41 Temporary failure The network is not functioning correctly
and an error occurred. The problem will be
resolved shortly.
Code Cause Definition