Chapter 6 - Testing and Troubleshooting
© Polycom, Inc. 115
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no longer valid.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.
Table 6-7. ISDN Call Status Codes (Continued)
Code Cause Definition
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